Home / 9,139.92-12,612.48-5,161.20

Finding the Fourth Proportional to 9,139.92, 12,612.48 and 5,161.20

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Solution

The fourth proportional to 9,139.92, 12,612.48 and 5,161.20 is: 7,122.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,139.92 : 12,612.48 = 5,161.20 : x
  2. Step 2: Convert to fraction form
    9,139.92/12,612.48 = 5,161.20/x
  3. Step 3: Cross multiply
    9,139.92x = 12,612.48 × 5,161.20
  4. Step 4: Simplify right side
    9,139.92x = 65,095,531.78
  5. Step 5: Solve for x
    x = 65,095,531.78/9,139.92
  6. Step 6: Final answer
    x = 7,122.11

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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.