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Finding the Fourth Proportional to 89.30, 133.98 and 79.28

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Solution

The fourth proportional to 89.30, 133.98 and 79.28 is: 118.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.30 : 133.98 = 79.28 : x
  2. Step 2: Convert to fraction form
    89.30/133.98 = 79.28/x
  3. Step 3: Cross multiply
    89.30x = 133.98 × 79.28
  4. Step 4: Simplify right side
    89.30x = 10,621.93
  5. Step 5: Solve for x
    x = 10,621.93/89.30
  6. Step 6: Final answer
    x = 118.95

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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.