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Finding the Fourth Proportional to 992.70, 1,487.98 and 472.38

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Solution

The fourth proportional to 992.70, 1,487.98 and 472.38 is: 708.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.70 : 1,487.98 = 472.38 : x
  2. Step 2: Convert to fraction form
    992.70/1,487.98 = 472.38/x
  3. Step 3: Cross multiply
    992.70x = 1,487.98 × 472.38
  4. Step 4: Simplify right side
    992.70x = 702,891.99
  5. Step 5: Solve for x
    x = 702,891.99/992.70
  6. Step 6: Final answer
    x = 708.06

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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.