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Finding the Fourth Proportional to 148.77, 205.40 and 99.73

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Solution

The fourth proportional to 148.77, 205.40 and 99.73 is: 137.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.77 : 205.40 = 99.73 : x
  2. Step 2: Convert to fraction form
    148.77/205.40 = 99.73/x
  3. Step 3: Cross multiply
    148.77x = 205.40 × 99.73
  4. Step 4: Simplify right side
    148.77x = 20,485.05
  5. Step 5: Solve for x
    x = 20,485.05/148.77
  6. Step 6: Final answer
    x = 137.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.