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Finding the Fourth Proportional to 717,449.20, 990,124.76 and 395,159.21

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Solution

The fourth proportional to 717,449.20, 990,124.76 and 395,159.21 is: 545,344.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,449.20 : 990,124.76 = 395,159.21 : x
  2. Step 2: Convert to fraction form
    717,449.20/990,124.76 = 395,159.21/x
  3. Step 3: Cross multiply
    717,449.20x = 990,124.76 × 395,159.21
  4. Step 4: Simplify right side
    717,449.20x = 391,256,917,713.28
  5. Step 5: Solve for x
    x = 391,256,917,713.28/717,449.20
  6. Step 6: Final answer
    x = 545,344.42

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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.