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Finding the Fourth Proportional to 94.08, 140.80 and 87.20

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Solution

The fourth proportional to 94.08, 140.80 and 87.20 is: 130.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.08 : 140.80 = 87.20 : x
  2. Step 2: Convert to fraction form
    94.08/140.80 = 87.20/x
  3. Step 3: Cross multiply
    94.08x = 140.80 × 87.20
  4. Step 4: Simplify right side
    94.08x = 12,277.76
  5. Step 5: Solve for x
    x = 12,277.76/94.08
  6. Step 6: Final answer
    x = 130.50

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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.