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Finding the Fourth Proportional to 84.88, 127.47 and 71.53

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Solution

The fourth proportional to 84.88, 127.47 and 71.53 is: 107.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.88 : 127.47 = 71.53 : x
  2. Step 2: Convert to fraction form
    84.88/127.47 = 71.53/x
  3. Step 3: Cross multiply
    84.88x = 127.47 × 71.53
  4. Step 4: Simplify right side
    84.88x = 9,117.93
  5. Step 5: Solve for x
    x = 9,117.93/84.88
  6. Step 6: Final answer
    x = 107.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.