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Finding the Fourth Proportional to 52.85, 72.90 and 38.31

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Solution

The fourth proportional to 52.85, 72.90 and 38.31 is: 52.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.85 : 72.90 = 38.31 : x
  2. Step 2: Convert to fraction form
    52.85/72.90 = 38.31/x
  3. Step 3: Cross multiply
    52.85x = 72.90 × 38.31
  4. Step 4: Simplify right side
    52.85x = 2,792.80
  5. Step 5: Solve for x
    x = 2,792.80/52.85
  6. Step 6: Final answer
    x = 52.85

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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.