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Finding the Fourth Proportional to 13,990.64, 20,964.84 and 8,437.80

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Solution

The fourth proportional to 13,990.64, 20,964.84 and 8,437.80 is: 12,643.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.64 : 20,964.84 = 8,437.80 : x
  2. Step 2: Convert to fraction form
    13,990.64/20,964.84 = 8,437.80/x
  3. Step 3: Cross multiply
    13,990.64x = 20,964.84 × 8,437.80
  4. Step 4: Simplify right side
    13,990.64x = 176,897,126.95
  5. Step 5: Solve for x
    x = 176,897,126.95/13,990.64
  6. Step 6: Final answer
    x = 12,643.96

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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.