Home / 8,640.08-11,920.19-5,657.61

Finding the Fourth Proportional to 8,640.08, 11,920.19 and 5,657.61

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Solution

The fourth proportional to 8,640.08, 11,920.19 and 5,657.61 is: 7,805.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640.08 : 11,920.19 = 5,657.61 : x
  2. Step 2: Convert to fraction form
    8,640.08/11,920.19 = 5,657.61/x
  3. Step 3: Cross multiply
    8,640.08x = 11,920.19 × 5,657.61
  4. Step 4: Simplify right side
    8,640.08x = 67,439,757.86
  5. Step 5: Solve for x
    x = 67,439,757.86/8,640.08
  6. Step 6: Final answer
    x = 7,805.46

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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.