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Finding the Fourth Proportional to 28,003.20, 42,008.80 and 8,279.20

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Solution

The fourth proportional to 28,003.20, 42,008.80 and 8,279.20 is: 12,419.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,003.20 : 42,008.80 = 8,279.20 : x
  2. Step 2: Convert to fraction form
    28,003.20/42,008.80 = 8,279.20/x
  3. Step 3: Cross multiply
    28,003.20x = 42,008.80 × 8,279.20
  4. Step 4: Simplify right side
    28,003.20x = 347,799,256.96
  5. Step 5: Solve for x
    x = 347,799,256.96/28,003.20
  6. Step 6: Final answer
    x = 12,419.98

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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.