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Finding the Fourth Proportional to 96.90, 145.19 and 76.55

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Solution

The fourth proportional to 96.90, 145.19 and 76.55 is: 114.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.90 : 145.19 = 76.55 : x
  2. Step 2: Convert to fraction form
    96.90/145.19 = 76.55/x
  3. Step 3: Cross multiply
    96.90x = 145.19 × 76.55
  4. Step 4: Simplify right side
    96.90x = 11,113.76
  5. Step 5: Solve for x
    x = 11,113.76/96.90
  6. Step 6: Final answer
    x = 114.70

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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.