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Finding the Fourth Proportional to 98.73, 147.90 and 55.35

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Solution

The fourth proportional to 98.73, 147.90 and 55.35 is: 82.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.73 : 147.90 = 55.35 : x
  2. Step 2: Convert to fraction form
    98.73/147.90 = 55.35/x
  3. Step 3: Cross multiply
    98.73x = 147.90 × 55.35
  4. Step 4: Simplify right side
    98.73x = 8,186.27
  5. Step 5: Solve for x
    x = 8,186.27/98.73
  6. Step 6: Final answer
    x = 82.92

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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.