Home / 13,139.92-18,126.66-7,831.72

Finding the Fourth Proportional to 13,139.92, 18,126.66 and 7,831.72

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Solution

The fourth proportional to 13,139.92, 18,126.66 and 7,831.72 is: 10,803.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.92 : 18,126.66 = 7,831.72 : x
  2. Step 2: Convert to fraction form
    13,139.92/18,126.66 = 7,831.72/x
  3. Step 3: Cross multiply
    13,139.92x = 18,126.66 × 7,831.72
  4. Step 4: Simplify right side
    13,139.92x = 141,962,925.66
  5. Step 5: Solve for x
    x = 141,962,925.66/13,139.92
  6. Step 6: Final answer
    x = 10,803.94

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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.