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Finding the Fourth Proportional to 148.91, 205.47 and 83.40

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Solution

The fourth proportional to 148.91, 205.47 and 83.40 is: 115.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.91 : 205.47 = 83.40 : x
  2. Step 2: Convert to fraction form
    148.91/205.47 = 83.40/x
  3. Step 3: Cross multiply
    148.91x = 205.47 × 83.40
  4. Step 4: Simplify right side
    148.91x = 17,135.43
  5. Step 5: Solve for x
    x = 17,135.43/148.91
  6. Step 6: Final answer
    x = 115.08

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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.