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Finding the Fourth Proportional to 85.62, 127.55 and 84

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Solution

The fourth proportional to 85.62, 127.55 and 84 is: 125.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.62 : 127.55 = 84 : x
  2. Step 2: Convert to fraction form
    85.62/127.55 = 84/x
  3. Step 3: Cross multiply
    85.62x = 127.55 × 84
  4. Step 4: Simplify right side
    85.62x = 10,714.20
  5. Step 5: Solve for x
    x = 10,714.20/85.62
  6. Step 6: Final answer
    x = 125.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.