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Finding the Fourth Proportional to 717,981.86, 990,640.95 and 407,815.40

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Solution

The fourth proportional to 717,981.86, 990,640.95 and 407,815.40 is: 562,686.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,981.86 : 990,640.95 = 407,815.40 : x
  2. Step 2: Convert to fraction form
    717,981.86/990,640.95 = 407,815.40/x
  3. Step 3: Cross multiply
    717,981.86x = 990,640.95 × 407,815.40
  4. Step 4: Simplify right side
    717,981.86x = 403,998,635,280.63
  5. Step 5: Solve for x
    x = 403,998,635,280.63/717,981.86
  6. Step 6: Final answer
    x = 562,686.41

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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.