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Finding the Fourth Proportional to 95.46, 142.25 and 86.34

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Solution

The fourth proportional to 95.46, 142.25 and 86.34 is: 128.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.46 : 142.25 = 86.34 : x
  2. Step 2: Convert to fraction form
    95.46/142.25 = 86.34/x
  3. Step 3: Cross multiply
    95.46x = 142.25 × 86.34
  4. Step 4: Simplify right side
    95.46x = 12,281.43
  5. Step 5: Solve for x
    x = 12,281.43/95.46
  6. Step 6: Final answer
    x = 128.66

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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.