Home / 20,720.15-28,594.14-11,288.72

Finding the Fourth Proportional to 20,720.15, 28,594.14 and 11,288.72

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Solution

The fourth proportional to 20,720.15, 28,594.14 and 11,288.72 is: 15,578.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.15 : 28,594.14 = 11,288.72 : x
  2. Step 2: Convert to fraction form
    20,720.15/28,594.14 = 11,288.72/x
  3. Step 3: Cross multiply
    20,720.15x = 28,594.14 × 11,288.72
  4. Step 4: Simplify right side
    20,720.15x = 322,791,240.10
  5. Step 5: Solve for x
    x = 322,791,240.10/20,720.15
  6. Step 6: Final answer
    x = 15,578.62

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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.