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Finding the Fourth Proportional to 94.18, 140.28 and 89.31

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Solution

The fourth proportional to 94.18, 140.28 and 89.31 is: 133.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.18 : 140.28 = 89.31 : x
  2. Step 2: Convert to fraction form
    94.18/140.28 = 89.31/x
  3. Step 3: Cross multiply
    94.18x = 140.28 × 89.31
  4. Step 4: Simplify right side
    94.18x = 12,527.71
  5. Step 5: Solve for x
    x = 12,527.71/94.18
  6. Step 6: Final answer
    x = 133.02

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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.