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Finding the Fourth Proportional to 99.43, 148.97 and 53.80

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Solution

The fourth proportional to 99.43, 148.97 and 53.80 is: 80.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.43 : 148.97 = 53.80 : x
  2. Step 2: Convert to fraction form
    99.43/148.97 = 53.80/x
  3. Step 3: Cross multiply
    99.43x = 148.97 × 53.80
  4. Step 4: Simplify right side
    99.43x = 8,014.35
  5. Step 5: Solve for x
    x = 8,014.35/99.43
  6. Step 6: Final answer
    x = 80.60

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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.