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Finding the Fourth Proportional to 542.48, 748.64 and 318.58

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Solution

The fourth proportional to 542.48, 748.64 and 318.58 is: 439.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.48 : 748.64 = 318.58 : x
  2. Step 2: Convert to fraction form
    542.48/748.64 = 318.58/x
  3. Step 3: Cross multiply
    542.48x = 748.64 × 318.58
  4. Step 4: Simplify right side
    542.48x = 238,500.36
  5. Step 5: Solve for x
    x = 238,500.36/542.48
  6. Step 6: Final answer
    x = 439.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.