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Finding the Fourth Proportional to 15.20, 22.80 and 5.57

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Solution

The fourth proportional to 15.20, 22.80 and 5.57 is: 8.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.20 : 22.80 = 5.57 : x
  2. Step 2: Convert to fraction form
    15.20/22.80 = 5.57/x
  3. Step 3: Cross multiply
    15.20x = 22.80 × 5.57
  4. Step 4: Simplify right side
    15.20x = 126.94
  5. Step 5: Solve for x
    x = 126.94/15.20
  6. Step 6: Final answer
    x = 8.35

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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.