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Finding the Fourth Proportional to 74.52, 111.62 and 57.36

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Solution

The fourth proportional to 74.52, 111.62 and 57.36 is: 85.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.52 : 111.62 = 57.36 : x
  2. Step 2: Convert to fraction form
    74.52/111.62 = 57.36/x
  3. Step 3: Cross multiply
    74.52x = 111.62 × 57.36
  4. Step 4: Simplify right side
    74.52x = 6,402.52
  5. Step 5: Solve for x
    x = 6,402.52/74.52
  6. Step 6: Final answer
    x = 85.92

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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.