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Finding the Fourth Proportional to 98.72, 136.20 and 57.27

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Solution

The fourth proportional to 98.72, 136.20 and 57.27 is: 79.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.72 : 136.20 = 57.27 : x
  2. Step 2: Convert to fraction form
    98.72/136.20 = 57.27/x
  3. Step 3: Cross multiply
    98.72x = 136.20 × 57.27
  4. Step 4: Simplify right side
    98.72x = 7,800.12
  5. Step 5: Solve for x
    x = 7,800.12/98.72
  6. Step 6: Final answer
    x = 79.01

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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.