Home / 20,512.89-28,309.92-12,560.40

Finding the Fourth Proportional to 20,512.89, 28,309.92 and 12,560.40

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Solution

The fourth proportional to 20,512.89, 28,309.92 and 12,560.40 is: 17,334.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,512.89 : 28,309.92 = 12,560.40 : x
  2. Step 2: Convert to fraction form
    20,512.89/28,309.92 = 12,560.40/x
  3. Step 3: Cross multiply
    20,512.89x = 28,309.92 × 12,560.40
  4. Step 4: Simplify right side
    20,512.89x = 355,583,919.17
  5. Step 5: Solve for x
    x = 355,583,919.17/20,512.89
  6. Step 6: Final answer
    x = 17,334.66

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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.