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Finding the Fourth Proportional to 59.72, 89.45 and 42.56

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Solution

The fourth proportional to 59.72, 89.45 and 42.56 is: 63.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.72 : 89.45 = 42.56 : x
  2. Step 2: Convert to fraction form
    59.72/89.45 = 42.56/x
  3. Step 3: Cross multiply
    59.72x = 89.45 × 42.56
  4. Step 4: Simplify right side
    59.72x = 3,807.44
  5. Step 5: Solve for x
    x = 3,807.44/59.72
  6. Step 6: Final answer
    x = 63.75

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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.