Home / 718,490.76-991,541.18-391,821.64

Finding the Fourth Proportional to 718,490.76, 991,541.18 and 391,821.64

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Solution

The fourth proportional to 718,490.76, 991,541.18 and 391,821.64 is: 540,726.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,490.76 : 991,541.18 = 391,821.64 : x
  2. Step 2: Convert to fraction form
    718,490.76/991,541.18 = 391,821.64/x
  3. Step 3: Cross multiply
    718,490.76x = 991,541.18 × 391,821.64
  4. Step 4: Simplify right side
    718,490.76x = 388,507,291,275.14
  5. Step 5: Solve for x
    x = 388,507,291,275.14/718,490.76
  6. Step 6: Final answer
    x = 540,726.91

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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.