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Finding the Fourth Proportional to 20,540.80, 28,401.60 and 17,916.40

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Solution

The fourth proportional to 20,540.80, 28,401.60 and 17,916.40 is: 24,772.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,540.80 : 28,401.60 = 17,916.40 : x
  2. Step 2: Convert to fraction form
    20,540.80/28,401.60 = 17,916.40/x
  3. Step 3: Cross multiply
    20,540.80x = 28,401.60 × 17,916.40
  4. Step 4: Simplify right side
    20,540.80x = 508,854,426.24
  5. Step 5: Solve for x
    x = 508,854,426.24/20,540.80
  6. Step 6: Final answer
    x = 24,772.86

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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.