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Finding the Fourth Proportional to 148.90, 205.46 and 86.72

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Solution

The fourth proportional to 148.90, 205.46 and 86.72 is: 119.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.90 : 205.46 = 86.72 : x
  2. Step 2: Convert to fraction form
    148.90/205.46 = 86.72/x
  3. Step 3: Cross multiply
    148.90x = 205.46 × 86.72
  4. Step 4: Simplify right side
    148.90x = 17,817.49
  5. Step 5: Solve for x
    x = 17,817.49/148.90
  6. Step 6: Final answer
    x = 119.66

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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.