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Finding the Fourth Proportional to 86.71, 119.67 and 55.63

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Solution

The fourth proportional to 86.71, 119.67 and 55.63 is: 76.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.71 : 119.67 = 55.63 : x
  2. Step 2: Convert to fraction form
    86.71/119.67 = 55.63/x
  3. Step 3: Cross multiply
    86.71x = 119.67 × 55.63
  4. Step 4: Simplify right side
    86.71x = 6,657.24
  5. Step 5: Solve for x
    x = 6,657.24/86.71
  6. Step 6: Final answer
    x = 76.78

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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.