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Finding the Fourth Proportional to 89.72, 134.40 and 59.21

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Solution

The fourth proportional to 89.72, 134.40 and 59.21 is: 88.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.72 : 134.40 = 59.21 : x
  2. Step 2: Convert to fraction form
    89.72/134.40 = 59.21/x
  3. Step 3: Cross multiply
    89.72x = 134.40 × 59.21
  4. Step 4: Simplify right side
    89.72x = 7,957.82
  5. Step 5: Solve for x
    x = 7,957.82/89.72
  6. Step 6: Final answer
    x = 88.70

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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.