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Finding the Fourth Proportional to 86.76, 129.98 and 55.83

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Solution

The fourth proportional to 86.76, 129.98 and 55.83 is: 83.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.76 : 129.98 = 55.83 : x
  2. Step 2: Convert to fraction form
    86.76/129.98 = 55.83/x
  3. Step 3: Cross multiply
    86.76x = 129.98 × 55.83
  4. Step 4: Simplify right side
    86.76x = 7,256.92
  5. Step 5: Solve for x
    x = 7,256.92/86.76
  6. Step 6: Final answer
    x = 83.64

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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.