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Finding the Fourth Proportional to 717,914.71, 990,728.85 and 395,636.32

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Solution

The fourth proportional to 717,914.71, 990,728.85 and 395,636.32 is: 545,981.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,914.71 : 990,728.85 = 395,636.32 : x
  2. Step 2: Convert to fraction form
    717,914.71/990,728.85 = 395,636.32/x
  3. Step 3: Cross multiply
    717,914.71x = 990,728.85 × 395,636.32
  4. Step 4: Simplify right side
    717,914.71x = 391,968,316,331.83
  5. Step 5: Solve for x
    x = 391,968,316,331.83/717,914.71
  6. Step 6: Final answer
    x = 545,981.73

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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.