Home / 7,125.30-9,831.38-4,139.61

Finding the Fourth Proportional to 7,125.30, 9,831.38 and 4,139.61

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Solution

The fourth proportional to 7,125.30, 9,831.38 and 4,139.61 is: 5,711.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,125.30 : 9,831.38 = 4,139.61 : x
  2. Step 2: Convert to fraction form
    7,125.30/9,831.38 = 4,139.61/x
  3. Step 3: Cross multiply
    7,125.30x = 9,831.38 × 4,139.61
  4. Step 4: Simplify right side
    7,125.30x = 40,698,021.40
  5. Step 5: Solve for x
    x = 40,698,021.40/7,125.30
  6. Step 6: Final answer
    x = 5,711.76

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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.