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Finding the Fourth Proportional to 74.90, 112.32 and 59.72

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Solution

The fourth proportional to 74.90, 112.32 and 59.72 is: 89.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.90 : 112.32 = 59.72 : x
  2. Step 2: Convert to fraction form
    74.90/112.32 = 59.72/x
  3. Step 3: Cross multiply
    74.90x = 112.32 × 59.72
  4. Step 4: Simplify right side
    74.90x = 6,707.75
  5. Step 5: Solve for x
    x = 6,707.75/74.90
  6. Step 6: Final answer
    x = 89.56

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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.