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Finding the Fourth Proportional to 12,312.80, 18,440.40 and 9,375.20

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Solution

The fourth proportional to 12,312.80, 18,440.40 and 9,375.20 is: 14,040.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,312.80 : 18,440.40 = 9,375.20 : x
  2. Step 2: Convert to fraction form
    12,312.80/18,440.40 = 9,375.20/x
  3. Step 3: Cross multiply
    12,312.80x = 18,440.40 × 9,375.20
  4. Step 4: Simplify right side
    12,312.80x = 172,882,438.08
  5. Step 5: Solve for x
    x = 172,882,438.08/12,312.80
  6. Step 6: Final answer
    x = 14,040.87

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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.