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Finding the Fourth Proportional to 992.38, 1,487.66 and 342.96

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Solution

The fourth proportional to 992.38, 1,487.66 and 342.96 is: 514.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.38 : 1,487.66 = 342.96 : x
  2. Step 2: Convert to fraction form
    992.38/1,487.66 = 342.96/x
  3. Step 3: Cross multiply
    992.38x = 1,487.66 × 342.96
  4. Step 4: Simplify right side
    992.38x = 510,207.87
  5. Step 5: Solve for x
    x = 510,207.87/992.38
  6. Step 6: Final answer
    x = 514.13

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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.