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Finding the Fourth Proportional to 8,389.60, 12,584.40 and 5,279.20

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Solution

The fourth proportional to 8,389.60, 12,584.40 and 5,279.20 is: 7,918.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,389.60 : 12,584.40 = 5,279.20 : x
  2. Step 2: Convert to fraction form
    8,389.60/12,584.40 = 5,279.20/x
  3. Step 3: Cross multiply
    8,389.60x = 12,584.40 × 5,279.20
  4. Step 4: Simplify right side
    8,389.60x = 66,435,564.48
  5. Step 5: Solve for x
    x = 66,435,564.48/8,389.60
  6. Step 6: Final answer
    x = 7,918.80

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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.