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Finding the Fourth Proportional to 992.48, 1,487.54 and 748.20

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Solution

The fourth proportional to 992.48, 1,487.54 and 748.20 is: 1,121.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.48 : 1,487.54 = 748.20 : x
  2. Step 2: Convert to fraction form
    992.48/1,487.54 = 748.20/x
  3. Step 3: Cross multiply
    992.48x = 1,487.54 × 748.20
  4. Step 4: Simplify right side
    992.48x = 1,112,977.43
  5. Step 5: Solve for x
    x = 1,112,977.43/992.48
  6. Step 6: Final answer
    x = 1,121.41

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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.