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Finding the Fourth Proportional to 102.70, 153.91 and 76.55

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Solution

The fourth proportional to 102.70, 153.91 and 76.55 is: 114.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.70 : 153.91 = 76.55 : x
  2. Step 2: Convert to fraction form
    102.70/153.91 = 76.55/x
  3. Step 3: Cross multiply
    102.70x = 153.91 × 76.55
  4. Step 4: Simplify right side
    102.70x = 11,782.00
  5. Step 5: Solve for x
    x = 11,782.00/102.70
  6. Step 6: Final answer
    x = 114.73

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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.