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Finding the Fourth Proportional to 116.72, 174.96 and 76.40

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Solution

The fourth proportional to 116.72, 174.96 and 76.40 is: 114.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.72 : 174.96 = 76.40 : x
  2. Step 2: Convert to fraction form
    116.72/174.96 = 76.40/x
  3. Step 3: Cross multiply
    116.72x = 174.96 × 76.40
  4. Step 4: Simplify right side
    116.72x = 13,366.94
  5. Step 5: Solve for x
    x = 13,366.94/116.72
  6. Step 6: Final answer
    x = 114.52

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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.