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Finding the Fourth Proportional to 89.37, 133.90 and 86.04

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Solution

The fourth proportional to 89.37, 133.90 and 86.04 is: 128.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.37 : 133.90 = 86.04 : x
  2. Step 2: Convert to fraction form
    89.37/133.90 = 86.04/x
  3. Step 3: Cross multiply
    89.37x = 133.90 × 86.04
  4. Step 4: Simplify right side
    89.37x = 11,520.76
  5. Step 5: Solve for x
    x = 11,520.76/89.37
  6. Step 6: Final answer
    x = 128.91

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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.