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Finding the Fourth Proportional to 86.91, 130.56 and 56.49

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Solution

The fourth proportional to 86.91, 130.56 and 56.49 is: 84.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.91 : 130.56 = 56.49 : x
  2. Step 2: Convert to fraction form
    86.91/130.56 = 56.49/x
  3. Step 3: Cross multiply
    86.91x = 130.56 × 56.49
  4. Step 4: Simplify right side
    86.91x = 7,375.33
  5. Step 5: Solve for x
    x = 7,375.33/86.91
  6. Step 6: Final answer
    x = 84.86

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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.