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Finding the Fourth Proportional to 95.13, 143.28 and 86.81

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Solution

The fourth proportional to 95.13, 143.28 and 86.81 is: 130.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.13 : 143.28 = 86.81 : x
  2. Step 2: Convert to fraction form
    95.13/143.28 = 86.81/x
  3. Step 3: Cross multiply
    95.13x = 143.28 × 86.81
  4. Step 4: Simplify right side
    95.13x = 12,437.42
  5. Step 5: Solve for x
    x = 12,437.42/95.13
  6. Step 6: Final answer
    x = 130.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.