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Finding the Fourth Proportional to 94.80, 142.40 and 90.16

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Solution

The fourth proportional to 94.80, 142.40 and 90.16 is: 135.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.80 : 142.40 = 90.16 : x
  2. Step 2: Convert to fraction form
    94.80/142.40 = 90.16/x
  3. Step 3: Cross multiply
    94.80x = 142.40 × 90.16
  4. Step 4: Simplify right side
    94.80x = 12,838.78
  5. Step 5: Solve for x
    x = 12,838.78/94.80
  6. Step 6: Final answer
    x = 135.43

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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.