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Finding the Fourth Proportional to 95.18, 131.38 and 56.40

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Solution

The fourth proportional to 95.18, 131.38 and 56.40 is: 77.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.18 : 131.38 = 56.40 : x
  2. Step 2: Convert to fraction form
    95.18/131.38 = 56.40/x
  3. Step 3: Cross multiply
    95.18x = 131.38 × 56.40
  4. Step 4: Simplify right side
    95.18x = 7,409.83
  5. Step 5: Solve for x
    x = 7,409.83/95.18
  6. Step 6: Final answer
    x = 77.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.