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Finding the Fourth Proportional to 98.85, 136.44 and 57.39

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Solution

The fourth proportional to 98.85, 136.44 and 57.39 is: 79.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.85 : 136.44 = 57.39 : x
  2. Step 2: Convert to fraction form
    98.85/136.44 = 57.39/x
  3. Step 3: Cross multiply
    98.85x = 136.44 × 57.39
  4. Step 4: Simplify right side
    98.85x = 7,830.29
  5. Step 5: Solve for x
    x = 7,830.29/98.85
  6. Step 6: Final answer
    x = 79.21

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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.