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Finding the Fourth Proportional to 98.87, 147.47 and 83.55

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Solution

The fourth proportional to 98.87, 147.47 and 83.55 is: 124.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.87 : 147.47 = 83.55 : x
  2. Step 2: Convert to fraction form
    98.87/147.47 = 83.55/x
  3. Step 3: Cross multiply
    98.87x = 147.47 × 83.55
  4. Step 4: Simplify right side
    98.87x = 12,320.89
  5. Step 5: Solve for x
    x = 12,320.89/98.87
  6. Step 6: Final answer
    x = 124.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.