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Finding the Fourth Proportional to 478,639.80, 717,084.90 and 291,432.60

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Solution

The fourth proportional to 478,639.80, 717,084.90 and 291,432.60 is: 436,616.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,639.80 : 717,084.90 = 291,432.60 : x
  2. Step 2: Convert to fraction form
    478,639.80/717,084.90 = 291,432.60/x
  3. Step 3: Cross multiply
    478,639.80x = 717,084.90 × 291,432.60
  4. Step 4: Simplify right side
    478,639.80x = 208,981,916,827.74
  5. Step 5: Solve for x
    x = 208,981,916,827.74/478,639.80
  6. Step 6: Final answer
    x = 436,616.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.