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Finding the Fourth Proportional to 148.07, 204.31 and 85.85

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Solution

The fourth proportional to 148.07, 204.31 and 85.85 is: 118.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.07 : 204.31 = 85.85 : x
  2. Step 2: Convert to fraction form
    148.07/204.31 = 85.85/x
  3. Step 3: Cross multiply
    148.07x = 204.31 × 85.85
  4. Step 4: Simplify right side
    148.07x = 17,538.78
  5. Step 5: Solve for x
    x = 17,538.78/148.07
  6. Step 6: Final answer
    x = 118.45

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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.