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Finding the Fourth Proportional to 15.56, 21.50 and 12.83

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Solution

The fourth proportional to 15.56, 21.50 and 12.83 is: 17.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.56 : 21.50 = 12.83 : x
  2. Step 2: Convert to fraction form
    15.56/21.50 = 12.83/x
  3. Step 3: Cross multiply
    15.56x = 21.50 × 12.83
  4. Step 4: Simplify right side
    15.56x = 275.72
  5. Step 5: Solve for x
    x = 275.72/15.56
  6. Step 6: Final answer
    x = 17.72

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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.