Home / 7,124.88-9,831.42-3,981.20

Finding the Fourth Proportional to 7,124.88, 9,831.42 and 3,981.20

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Solution

The fourth proportional to 7,124.88, 9,831.42 and 3,981.20 is: 5,493.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,124.88 : 9,831.42 = 3,981.20 : x
  2. Step 2: Convert to fraction form
    7,124.88/9,831.42 = 3,981.20/x
  3. Step 3: Cross multiply
    7,124.88x = 9,831.42 × 3,981.20
  4. Step 4: Simplify right side
    7,124.88x = 39,140,849.30
  5. Step 5: Solve for x
    x = 39,140,849.30/7,124.88
  6. Step 6: Final answer
    x = 5,493.55

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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.