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Finding the Fourth Proportional to 98.69, 136.17 and 77.70

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Solution

The fourth proportional to 98.69, 136.17 and 77.70 is: 107.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.69 : 136.17 = 77.70 : x
  2. Step 2: Convert to fraction form
    98.69/136.17 = 77.70/x
  3. Step 3: Cross multiply
    98.69x = 136.17 × 77.70
  4. Step 4: Simplify right side
    98.69x = 10,580.41
  5. Step 5: Solve for x
    x = 10,580.41/98.69
  6. Step 6: Final answer
    x = 107.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.