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Finding the Fourth Proportional to 476.97, 715.59 and 391.11

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Solution

The fourth proportional to 476.97, 715.59 and 391.11 is: 586.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.97 : 715.59 = 391.11 : x
  2. Step 2: Convert to fraction form
    476.97/715.59 = 391.11/x
  3. Step 3: Cross multiply
    476.97x = 715.59 × 391.11
  4. Step 4: Simplify right side
    476.97x = 279,874.40
  5. Step 5: Solve for x
    x = 279,874.40/476.97
  6. Step 6: Final answer
    x = 586.78

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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.