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Finding the Fourth Proportional to 323,831.80, 485,747.70 and 311,390.20

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Solution

The fourth proportional to 323,831.80, 485,747.70 and 311,390.20 is: 467,085.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,831.80 : 485,747.70 = 311,390.20 : x
  2. Step 2: Convert to fraction form
    323,831.80/485,747.70 = 311,390.20/x
  3. Step 3: Cross multiply
    323,831.80x = 485,747.70 × 311,390.20
  4. Step 4: Simplify right side
    323,831.80x = 151,257,073,452.54
  5. Step 5: Solve for x
    x = 151,257,073,452.54/323,831.80
  6. Step 6: Final answer
    x = 467,085.30

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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.