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Finding the Fourth Proportional to 89.47, 133.48 and 79.72

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Solution

The fourth proportional to 89.47, 133.48 and 79.72 is: 118.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.47 : 133.48 = 79.72 : x
  2. Step 2: Convert to fraction form
    89.47/133.48 = 79.72/x
  3. Step 3: Cross multiply
    89.47x = 133.48 × 79.72
  4. Step 4: Simplify right side
    89.47x = 10,641.03
  5. Step 5: Solve for x
    x = 10,641.03/89.47
  6. Step 6: Final answer
    x = 118.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.