Home / 10,862.40-16,279.20-7,780.80

Finding the Fourth Proportional to 10,862.40, 16,279.20 and 7,780.80

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Solution

The fourth proportional to 10,862.40, 16,279.20 and 7,780.80 is: 11,660.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,862.40 : 16,279.20 = 7,780.80 : x
  2. Step 2: Convert to fraction form
    10,862.40/16,279.20 = 7,780.80/x
  3. Step 3: Cross multiply
    10,862.40x = 16,279.20 × 7,780.80
  4. Step 4: Simplify right side
    10,862.40x = 126,665,199.36
  5. Step 5: Solve for x
    x = 126,665,199.36/10,862.40
  6. Step 6: Final answer
    x = 11,660.89

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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.