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Finding the Fourth Proportional to 7,122.92, 9,831.92 and 4,138.20

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Solution

The fourth proportional to 7,122.92, 9,831.92 and 4,138.20 is: 5,712.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,122.92 : 9,831.92 = 4,138.20 : x
  2. Step 2: Convert to fraction form
    7,122.92/9,831.92 = 4,138.20/x
  3. Step 3: Cross multiply
    7,122.92x = 9,831.92 × 4,138.20
  4. Step 4: Simplify right side
    7,122.92x = 40,686,430.65
  5. Step 5: Solve for x
    x = 40,686,430.65/7,122.92
  6. Step 6: Final answer
    x = 5,712.05

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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.