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Finding the Fourth Proportional to 21,487.88, 32,219.26 and 12,123.88

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Solution

The fourth proportional to 21,487.88, 32,219.26 and 12,123.88 is: 18,178.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,487.88 : 32,219.26 = 12,123.88 : x
  2. Step 2: Convert to fraction form
    21,487.88/32,219.26 = 12,123.88/x
  3. Step 3: Cross multiply
    21,487.88x = 32,219.26 × 12,123.88
  4. Step 4: Simplify right side
    21,487.88x = 390,622,441.93
  5. Step 5: Solve for x
    x = 390,622,441.93/21,487.88
  6. Step 6: Final answer
    x = 18,178.73

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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.