Home / 20,920.61-28,871.10-11,489.18

Finding the Fourth Proportional to 20,920.61, 28,871.10 and 11,489.18

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Solution

The fourth proportional to 20,920.61, 28,871.10 and 11,489.18 is: 15,855.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.61 : 28,871.10 = 11,489.18 : x
  2. Step 2: Convert to fraction form
    20,920.61/28,871.10 = 11,489.18/x
  3. Step 3: Cross multiply
    20,920.61x = 28,871.10 × 11,489.18
  4. Step 4: Simplify right side
    20,920.61x = 331,705,120.34
  5. Step 5: Solve for x
    x = 331,705,120.34/20,920.61
  6. Step 6: Final answer
    x = 15,855.43

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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.