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Finding the Fourth Proportional to 260,831.06, 391,302.72 and 80,912.90

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Solution

The fourth proportional to 260,831.06, 391,302.72 and 80,912.90 is: 121,386.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,831.06 : 391,302.72 = 80,912.90 : x
  2. Step 2: Convert to fraction form
    260,831.06/391,302.72 = 80,912.90/x
  3. Step 3: Cross multiply
    260,831.06x = 391,302.72 × 80,912.90
  4. Step 4: Simplify right side
    260,831.06x = 31,661,436,672.55
  5. Step 5: Solve for x
    x = 31,661,436,672.55/260,831.06
  6. Step 6: Final answer
    x = 121,386.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.