Home / 7,125.66-9,831.48-3,981.78

Finding the Fourth Proportional to 7,125.66, 9,831.48 and 3,981.78

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Solution

The fourth proportional to 7,125.66, 9,831.48 and 3,981.78 is: 5,493.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,125.66 : 9,831.48 = 3,981.78 : x
  2. Step 2: Convert to fraction form
    7,125.66/9,831.48 = 3,981.78/x
  3. Step 3: Cross multiply
    7,125.66x = 9,831.48 × 3,981.78
  4. Step 4: Simplify right side
    7,125.66x = 39,146,790.43
  5. Step 5: Solve for x
    x = 39,146,790.43/7,125.66
  6. Step 6: Final answer
    x = 5,493.78

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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.