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Finding the Fourth Proportional to 8,580.80, 12,890.40 and 8,350.40

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Solution

The fourth proportional to 8,580.80, 12,890.40 and 8,350.40 is: 12,544.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,580.80 : 12,890.40 = 8,350.40 : x
  2. Step 2: Convert to fraction form
    8,580.80/12,890.40 = 8,350.40/x
  3. Step 3: Cross multiply
    8,580.80x = 12,890.40 × 8,350.40
  4. Step 4: Simplify right side
    8,580.80x = 107,639,996.16
  5. Step 5: Solve for x
    x = 107,639,996.16/8,580.80
  6. Step 6: Final answer
    x = 12,544.28

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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.