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Finding the Fourth Proportional to 95.10, 142.68 and 78.15

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Solution

The fourth proportional to 95.10, 142.68 and 78.15 is: 117.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.10 : 142.68 = 78.15 : x
  2. Step 2: Convert to fraction form
    95.10/142.68 = 78.15/x
  3. Step 3: Cross multiply
    95.10x = 142.68 × 78.15
  4. Step 4: Simplify right side
    95.10x = 11,150.44
  5. Step 5: Solve for x
    x = 11,150.44/95.10
  6. Step 6: Final answer
    x = 117.25

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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.