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Finding the Fourth Proportional to 99.87, 148.60 and 99.53

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Solution

The fourth proportional to 99.87, 148.60 and 99.53 is: 148.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.87 : 148.60 = 99.53 : x
  2. Step 2: Convert to fraction form
    99.87/148.60 = 99.53/x
  3. Step 3: Cross multiply
    99.87x = 148.60 × 99.53
  4. Step 4: Simplify right side
    99.87x = 14,789.99
  5. Step 5: Solve for x
    x = 14,789.99/99.87
  6. Step 6: Final answer
    x = 148.10

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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.