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Finding the Fourth Proportional to 8,580.40, 12,870.60 and 6,276.40

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Solution

The fourth proportional to 8,580.40, 12,870.60 and 6,276.40 is: 9,414.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,580.40 : 12,870.60 = 6,276.40 : x
  2. Step 2: Convert to fraction form
    8,580.40/12,870.60 = 6,276.40/x
  3. Step 3: Cross multiply
    8,580.40x = 12,870.60 × 6,276.40
  4. Step 4: Simplify right side
    8,580.40x = 80,781,033.84
  5. Step 5: Solve for x
    x = 80,781,033.84/8,580.40
  6. Step 6: Final answer
    x = 9,414.60

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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.