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Finding the Fourth Proportional to 718.92, 991.82 and 486.68

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Solution

The fourth proportional to 718.92, 991.82 and 486.68 is: 671.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.92 : 991.82 = 486.68 : x
  2. Step 2: Convert to fraction form
    718.92/991.82 = 486.68/x
  3. Step 3: Cross multiply
    718.92x = 991.82 × 486.68
  4. Step 4: Simplify right side
    718.92x = 482,698.96
  5. Step 5: Solve for x
    x = 482,698.96/718.92
  6. Step 6: Final answer
    x = 671.42

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Double scale
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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.