Home / 9,115.20-13,640.40-6,328.80

Finding the Fourth Proportional to 9,115.20, 13,640.40 and 6,328.80

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Solution

The fourth proportional to 9,115.20, 13,640.40 and 6,328.80 is: 9,470.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,115.20 : 13,640.40 = 6,328.80 : x
  2. Step 2: Convert to fraction form
    9,115.20/13,640.40 = 6,328.80/x
  3. Step 3: Cross multiply
    9,115.20x = 13,640.40 × 6,328.80
  4. Step 4: Simplify right side
    9,115.20x = 86,327,363.52
  5. Step 5: Solve for x
    x = 86,327,363.52/9,115.20
  6. Step 6: Final answer
    x = 9,470.70

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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.