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Finding the Fourth Proportional to 76.59, 114.71 and 61.40

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Solution

The fourth proportional to 76.59, 114.71 and 61.40 is: 91.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.59 : 114.71 = 61.40 : x
  2. Step 2: Convert to fraction form
    76.59/114.71 = 61.40/x
  3. Step 3: Cross multiply
    76.59x = 114.71 × 61.40
  4. Step 4: Simplify right side
    76.59x = 7,042.31
  5. Step 5: Solve for x
    x = 7,042.31/76.59
  6. Step 6: Final answer
    x = 91.95

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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.