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Finding the Fourth Proportional to 8,432.70, 12,661.20 and 5,978.40

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Solution

The fourth proportional to 8,432.70, 12,661.20 and 5,978.40 is: 8,976.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,432.70 : 12,661.20 = 5,978.40 : x
  2. Step 2: Convert to fraction form
    8,432.70/12,661.20 = 5,978.40/x
  3. Step 3: Cross multiply
    8,432.70x = 12,661.20 × 5,978.40
  4. Step 4: Simplify right side
    8,432.70x = 75,693,718.08
  5. Step 5: Solve for x
    x = 75,693,718.08/8,432.70
  6. Step 6: Final answer
    x = 8,976.21

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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.