Home / 8,279.87-11,430.45-6,387.20

Finding the Fourth Proportional to 8,279.87, 11,430.45 and 6,387.20

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Solution

The fourth proportional to 8,279.87, 11,430.45 and 6,387.20 is: 8,817.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,279.87 : 11,430.45 = 6,387.20 : x
  2. Step 2: Convert to fraction form
    8,279.87/11,430.45 = 6,387.20/x
  3. Step 3: Cross multiply
    8,279.87x = 11,430.45 × 6,387.20
  4. Step 4: Simplify right side
    8,279.87x = 73,008,647.19
  5. Step 5: Solve for x
    x = 73,008,647.19/8,279.87
  6. Step 6: Final answer
    x = 8,817.61

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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.