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Finding the Fourth Proportional to 89.72, 134.52 and 77.74

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Solution

The fourth proportional to 89.72, 134.52 and 77.74 is: 116.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.72 : 134.52 = 77.74 : x
  2. Step 2: Convert to fraction form
    89.72/134.52 = 77.74/x
  3. Step 3: Cross multiply
    89.72x = 134.52 × 77.74
  4. Step 4: Simplify right side
    89.72x = 10,457.58
  5. Step 5: Solve for x
    x = 10,457.58/89.72
  6. Step 6: Final answer
    x = 116.56

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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.