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Finding the Fourth Proportional to 715.80, 1,071.65 and 406.92

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Solution

The fourth proportional to 715.80, 1,071.65 and 406.92 is: 609.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.80 : 1,071.65 = 406.92 : x
  2. Step 2: Convert to fraction form
    715.80/1,071.65 = 406.92/x
  3. Step 3: Cross multiply
    715.80x = 1,071.65 × 406.92
  4. Step 4: Simplify right side
    715.80x = 436,073.78
  5. Step 5: Solve for x
    x = 436,073.78/715.80
  6. Step 6: Final answer
    x = 609.21

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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.