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Finding the Fourth Proportional to 148.60, 204.86 and 123.72

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Solution

The fourth proportional to 148.60, 204.86 and 123.72 is: 170.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.60 : 204.86 = 123.72 : x
  2. Step 2: Convert to fraction form
    148.60/204.86 = 123.72/x
  3. Step 3: Cross multiply
    148.60x = 204.86 × 123.72
  4. Step 4: Simplify right side
    148.60x = 25,345.28
  5. Step 5: Solve for x
    x = 25,345.28/148.60
  6. Step 6: Final answer
    x = 170.56

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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.