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Finding the Fourth Proportional to 89.04, 133.38 and 80.76

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Solution

The fourth proportional to 89.04, 133.38 and 80.76 is: 120.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.04 : 133.38 = 80.76 : x
  2. Step 2: Convert to fraction form
    89.04/133.38 = 80.76/x
  3. Step 3: Cross multiply
    89.04x = 133.38 × 80.76
  4. Step 4: Simplify right side
    89.04x = 10,771.77
  5. Step 5: Solve for x
    x = 10,771.77/89.04
  6. Step 6: Final answer
    x = 120.98

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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.