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Finding the Fourth Proportional to 99.20, 148.89 and 53.57

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Solution

The fourth proportional to 99.20, 148.89 and 53.57 is: 80.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.20 : 148.89 = 53.57 : x
  2. Step 2: Convert to fraction form
    99.20/148.89 = 53.57/x
  3. Step 3: Cross multiply
    99.20x = 148.89 × 53.57
  4. Step 4: Simplify right side
    99.20x = 7,976.04
  5. Step 5: Solve for x
    x = 7,976.04/99.20
  6. Step 6: Final answer
    x = 80.40

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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.