Home / 20,456.30-28,228.95-11,381.61

Finding the Fourth Proportional to 20,456.30, 28,228.95 and 11,381.61

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Solution

The fourth proportional to 20,456.30, 28,228.95 and 11,381.61 is: 15,706.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,456.30 : 28,228.95 = 11,381.61 : x
  2. Step 2: Convert to fraction form
    20,456.30/28,228.95 = 11,381.61/x
  3. Step 3: Cross multiply
    20,456.30x = 28,228.95 × 11,381.61
  4. Step 4: Simplify right side
    20,456.30x = 321,290,899.61
  5. Step 5: Solve for x
    x = 321,290,899.61/20,456.30
  6. Step 6: Final answer
    x = 15,706.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.