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Finding the Fourth Proportional to 102.56, 153.80 and 51.16

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Solution

The fourth proportional to 102.56, 153.80 and 51.16 is: 76.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.56 : 153.80 = 51.16 : x
  2. Step 2: Convert to fraction form
    102.56/153.80 = 51.16/x
  3. Step 3: Cross multiply
    102.56x = 153.80 × 51.16
  4. Step 4: Simplify right side
    102.56x = 7,868.41
  5. Step 5: Solve for x
    x = 7,868.41/102.56
  6. Step 6: Final answer
    x = 76.72

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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.