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Finding the Fourth Proportional to 13,990.80, 20,957.04 and 8,780.88

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Solution

The fourth proportional to 13,990.80, 20,957.04 and 8,780.88 is: 13,153.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.80 : 20,957.04 = 8,780.88 : x
  2. Step 2: Convert to fraction form
    13,990.80/20,957.04 = 8,780.88/x
  3. Step 3: Cross multiply
    13,990.80x = 20,957.04 × 8,780.88
  4. Step 4: Simplify right side
    13,990.80x = 184,021,253.40
  5. Step 5: Solve for x
    x = 184,021,253.40/13,990.80
  6. Step 6: Final answer
    x = 13,153.02

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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.