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Finding the Fourth Proportional to 20,487.60, 28,279.80 and 17,722.80

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Solution

The fourth proportional to 20,487.60, 28,279.80 and 17,722.80 is: 24,463.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.60 : 28,279.80 = 17,722.80 : x
  2. Step 2: Convert to fraction form
    20,487.60/28,279.80 = 17,722.80/x
  3. Step 3: Cross multiply
    20,487.60x = 28,279.80 × 17,722.80
  4. Step 4: Simplify right side
    20,487.60x = 501,197,239.44
  5. Step 5: Solve for x
    x = 501,197,239.44/20,487.60
  6. Step 6: Final answer
    x = 24,463.44

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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.