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Finding the Fourth Proportional to 86.87, 130.08 and 56.39

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Solution

The fourth proportional to 86.87, 130.08 and 56.39 is: 84.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.87 : 130.08 = 56.39 : x
  2. Step 2: Convert to fraction form
    86.87/130.08 = 56.39/x
  3. Step 3: Cross multiply
    86.87x = 130.08 × 56.39
  4. Step 4: Simplify right side
    86.87x = 7,335.54
  5. Step 5: Solve for x
    x = 7,335.54/86.87
  6. Step 6: Final answer
    x = 84.44

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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.