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Finding the Fourth Proportional to 13,988.91, 20,972.89 and 8,440.95

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Solution

The fourth proportional to 13,988.91, 20,972.89 and 8,440.95 is: 12,655.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,988.91 : 20,972.89 = 8,440.95 : x
  2. Step 2: Convert to fraction form
    13,988.91/20,972.89 = 8,440.95/x
  3. Step 3: Cross multiply
    13,988.91x = 20,972.89 × 8,440.95
  4. Step 4: Simplify right side
    13,988.91x = 177,031,010.98
  5. Step 5: Solve for x
    x = 177,031,010.98/13,988.91
  6. Step 6: Final answer
    x = 12,655.09

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1.5x scale

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.