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Finding the Fourth Proportional to 76.55, 114.28 and 66.83

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Solution

The fourth proportional to 76.55, 114.28 and 66.83 is: 99.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.55 : 114.28 = 66.83 : x
  2. Step 2: Convert to fraction form
    76.55/114.28 = 66.83/x
  3. Step 3: Cross multiply
    76.55x = 114.28 × 66.83
  4. Step 4: Simplify right side
    76.55x = 7,636.59
  5. Step 5: Solve for x
    x = 7,636.59/76.55
  6. Step 6: Final answer
    x = 99.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.