Home / 13,139.97-18,129.77-7,831.04

Finding the Fourth Proportional to 13,139.97, 18,129.77 and 7,831.04

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Solution

The fourth proportional to 13,139.97, 18,129.77 and 7,831.04 is: 10,804.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.97 : 18,129.77 = 7,831.04 : x
  2. Step 2: Convert to fraction form
    13,139.97/18,129.77 = 7,831.04/x
  3. Step 3: Cross multiply
    13,139.97x = 18,129.77 × 7,831.04
  4. Step 4: Simplify right side
    13,139.97x = 141,974,824.26
  5. Step 5: Solve for x
    x = 141,974,824.26/13,139.97
  6. Step 6: Final answer
    x = 10,804.81

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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.