Home / 20,920.50-28,870.29-11,488.86

Finding the Fourth Proportional to 20,920.50, 28,870.29 and 11,488.86

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Solution

The fourth proportional to 20,920.50, 28,870.29 and 11,488.86 is: 15,854.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.50 : 28,870.29 = 11,488.86 : x
  2. Step 2: Convert to fraction form
    20,920.50/28,870.29 = 11,488.86/x
  3. Step 3: Cross multiply
    20,920.50x = 28,870.29 × 11,488.86
  4. Step 4: Simplify right side
    20,920.50x = 331,686,719.97
  5. Step 5: Solve for x
    x = 331,686,719.97/20,920.50
  6. Step 6: Final answer
    x = 15,854.63

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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.