Home / 8,428.30-12,642.45-2,187.80

Finding the Fourth Proportional to 8,428.30, 12,642.45 and 2,187.80

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Solution

The fourth proportional to 8,428.30, 12,642.45 and 2,187.80 is: 3,281.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,428.30 : 12,642.45 = 2,187.80 : x
  2. Step 2: Convert to fraction form
    8,428.30/12,642.45 = 2,187.80/x
  3. Step 3: Cross multiply
    8,428.30x = 12,642.45 × 2,187.80
  4. Step 4: Simplify right side
    8,428.30x = 27,659,128.78
  5. Step 5: Solve for x
    x = 27,659,128.78/8,428.30
  6. Step 6: Final answer
    x = 3,281.70

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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.