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Finding the Fourth Proportional to 102.72, 153.98 and 57.09

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Solution

The fourth proportional to 102.72, 153.98 and 57.09 is: 85.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.72 : 153.98 = 57.09 : x
  2. Step 2: Convert to fraction form
    102.72/153.98 = 57.09/x
  3. Step 3: Cross multiply
    102.72x = 153.98 × 57.09
  4. Step 4: Simplify right side
    102.72x = 8,790.43
  5. Step 5: Solve for x
    x = 8,790.43/102.72
  6. Step 6: Final answer
    x = 85.58

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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.