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Finding the Fourth Proportional to 94.47, 129.61 and 89.88

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Solution

The fourth proportional to 94.47, 129.61 and 89.88 is: 123.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.47 : 129.61 = 89.88 : x
  2. Step 2: Convert to fraction form
    94.47/129.61 = 89.88/x
  3. Step 3: Cross multiply
    94.47x = 129.61 × 89.88
  4. Step 4: Simplify right side
    94.47x = 11,649.35
  5. Step 5: Solve for x
    x = 11,649.35/94.47
  6. Step 6: Final answer
    x = 123.31

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.