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Finding the Fourth Proportional to 28,279.20, 42,418.80 and 7,219.20

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Solution

The fourth proportional to 28,279.20, 42,418.80 and 7,219.20 is: 10,828.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,279.20 : 42,418.80 = 7,219.20 : x
  2. Step 2: Convert to fraction form
    28,279.20/42,418.80 = 7,219.20/x
  3. Step 3: Cross multiply
    28,279.20x = 42,418.80 × 7,219.20
  4. Step 4: Simplify right side
    28,279.20x = 306,229,800.96
  5. Step 5: Solve for x
    x = 306,229,800.96/28,279.20
  6. Step 6: Final answer
    x = 10,828.80

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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.