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Finding the Fourth Proportional to 89.76, 134.51 and 66.84

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Solution

The fourth proportional to 89.76, 134.51 and 66.84 is: 100.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.76 : 134.51 = 66.84 : x
  2. Step 2: Convert to fraction form
    89.76/134.51 = 66.84/x
  3. Step 3: Cross multiply
    89.76x = 134.51 × 66.84
  4. Step 4: Simplify right side
    89.76x = 8,989.64
  5. Step 5: Solve for x
    x = 8,989.64/89.76
  6. Step 6: Final answer
    x = 100.15

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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.