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Finding the Fourth Proportional to 148.68, 205.20 and 111.87

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Solution

The fourth proportional to 148.68, 205.20 and 111.87 is: 154.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.68 : 205.20 = 111.87 : x
  2. Step 2: Convert to fraction form
    148.68/205.20 = 111.87/x
  3. Step 3: Cross multiply
    148.68x = 205.20 × 111.87
  4. Step 4: Simplify right side
    148.68x = 22,955.72
  5. Step 5: Solve for x
    x = 22,955.72/148.68
  6. Step 6: Final answer
    x = 154.40

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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.