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Finding the Fourth Proportional to 20,402.80, 30,545.80 and 12,558.80

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Solution

The fourth proportional to 20,402.80, 30,545.80 and 12,558.80 is: 18,802.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,402.80 : 30,545.80 = 12,558.80 : x
  2. Step 2: Convert to fraction form
    20,402.80/30,545.80 = 12,558.80/x
  3. Step 3: Cross multiply
    20,402.80x = 30,545.80 × 12,558.80
  4. Step 4: Simplify right side
    20,402.80x = 383,618,593.04
  5. Step 5: Solve for x
    x = 383,618,593.04/20,402.80
  6. Step 6: Final answer
    x = 18,802.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.