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Finding the Fourth Proportional to 8,279.20, 12,397.20 and 7,890.40

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Solution

The fourth proportional to 8,279.20, 12,397.20 and 7,890.40 is: 11,815.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,279.20 : 12,397.20 = 7,890.40 : x
  2. Step 2: Convert to fraction form
    8,279.20/12,397.20 = 7,890.40/x
  3. Step 3: Cross multiply
    8,279.20x = 12,397.20 × 7,890.40
  4. Step 4: Simplify right side
    8,279.20x = 97,818,866.88
  5. Step 5: Solve for x
    x = 97,818,866.88/8,279.20
  6. Step 6: Final answer
    x = 11,815.01

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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.