Home / 718,707.96-991,821.66-396,426.76

Finding the Fourth Proportional to 718,707.96, 991,821.66 and 396,426.76

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Solution

The fourth proportional to 718,707.96, 991,821.66 and 396,426.76 is: 547,071.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,707.96 : 991,821.66 = 396,426.76 : x
  2. Step 2: Convert to fraction form
    718,707.96/991,821.66 = 396,426.76/x
  3. Step 3: Cross multiply
    718,707.96x = 991,821.66 × 396,426.76
  4. Step 4: Simplify right side
    718,707.96x = 393,184,647,171.62
  5. Step 5: Solve for x
    x = 393,184,647,171.62/718,707.96
  6. Step 6: Final answer
    x = 547,071.51

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.