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Finding the Fourth Proportional to 15.57, 23.35 and 12.20

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Solution

The fourth proportional to 15.57, 23.35 and 12.20 is: 18.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.57 : 23.35 = 12.20 : x
  2. Step 2: Convert to fraction form
    15.57/23.35 = 12.20/x
  3. Step 3: Cross multiply
    15.57x = 23.35 × 12.20
  4. Step 4: Simplify right side
    15.57x = 284.72
  5. Step 5: Solve for x
    x = 284.72/15.57
  6. Step 6: Final answer
    x = 18.29

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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.