Home / 20,920.56-28,870.38-11,489.70

Finding the Fourth Proportional to 20,920.56, 28,870.38 and 11,489.70

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Solution

The fourth proportional to 20,920.56, 28,870.38 and 11,489.70 is: 15,855.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.56 : 28,870.38 = 11,489.70 : x
  2. Step 2: Convert to fraction form
    20,920.56/28,870.38 = 11,489.70/x
  3. Step 3: Cross multiply
    20,920.56x = 28,870.38 × 11,489.70
  4. Step 4: Simplify right side
    20,920.56x = 331,712,005.09
  5. Step 5: Solve for x
    x = 331,712,005.09/20,920.56
  6. Step 6: Final answer
    x = 15,855.79

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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.