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Finding the Fourth Proportional to 94.29, 140.64 and 89.70

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Solution

The fourth proportional to 94.29, 140.64 and 89.70 is: 133.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.29 : 140.64 = 89.70 : x
  2. Step 2: Convert to fraction form
    94.29/140.64 = 89.70/x
  3. Step 3: Cross multiply
    94.29x = 140.64 × 89.70
  4. Step 4: Simplify right side
    94.29x = 12,615.41
  5. Step 5: Solve for x
    x = 12,615.41/94.29
  6. Step 6: Final answer
    x = 133.79

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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.