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Finding the Fourth Proportional to 95.40, 142.45 and 75.15

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Solution

The fourth proportional to 95.40, 142.45 and 75.15 is: 112.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.40 : 142.45 = 75.15 : x
  2. Step 2: Convert to fraction form
    95.40/142.45 = 75.15/x
  3. Step 3: Cross multiply
    95.40x = 142.45 × 75.15
  4. Step 4: Simplify right side
    95.40x = 10,705.12
  5. Step 5: Solve for x
    x = 10,705.12/95.40
  6. Step 6: Final answer
    x = 112.21

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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.