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Finding the Fourth Proportional to 7,143.20, 10,714.80 and 6,279.20

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Solution

The fourth proportional to 7,143.20, 10,714.80 and 6,279.20 is: 9,418.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,143.20 : 10,714.80 = 6,279.20 : x
  2. Step 2: Convert to fraction form
    7,143.20/10,714.80 = 6,279.20/x
  3. Step 3: Cross multiply
    7,143.20x = 10,714.80 × 6,279.20
  4. Step 4: Simplify right side
    7,143.20x = 67,280,372.16
  5. Step 5: Solve for x
    x = 67,280,372.16/7,143.20
  6. Step 6: Final answer
    x = 9,418.80

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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.