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Finding the Fourth Proportional to 421,363.20, 631,123.20 and 327,129.60

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Solution

The fourth proportional to 421,363.20, 631,123.20 and 327,129.60 is: 489,978.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,363.20 : 631,123.20 = 327,129.60 : x
  2. Step 2: Convert to fraction form
    421,363.20/631,123.20 = 327,129.60/x
  3. Step 3: Cross multiply
    421,363.20x = 631,123.20 × 327,129.60
  4. Step 4: Simplify right side
    421,363.20x = 206,459,079,966.72
  5. Step 5: Solve for x
    x = 206,459,079,966.72/421,363.20
  6. Step 6: Final answer
    x = 489,978.91

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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.