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Finding the Fourth Proportional to 84.63, 116.69 and 55.47

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Solution

The fourth proportional to 84.63, 116.69 and 55.47 is: 76.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.63 : 116.69 = 55.47 : x
  2. Step 2: Convert to fraction form
    84.63/116.69 = 55.47/x
  3. Step 3: Cross multiply
    84.63x = 116.69 × 55.47
  4. Step 4: Simplify right side
    84.63x = 6,471.93
  5. Step 5: Solve for x
    x = 6,471.93/84.63
  6. Step 6: Final answer
    x = 76.48

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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.