Home / 20,720.40-28,594.20-11,288.76

Finding the Fourth Proportional to 20,720.40, 28,594.20 and 11,288.76

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Solution

The fourth proportional to 20,720.40, 28,594.20 and 11,288.76 is: 15,578.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.40 : 28,594.20 = 11,288.76 : x
  2. Step 2: Convert to fraction form
    20,720.40/28,594.20 = 11,288.76/x
  3. Step 3: Cross multiply
    20,720.40x = 28,594.20 × 11,288.76
  4. Step 4: Simplify right side
    20,720.40x = 322,793,061.19
  5. Step 5: Solve for x
    x = 322,793,061.19/20,720.40
  6. Step 6: Final answer
    x = 15,578.51

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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.