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Finding the Fourth Proportional to 421,324.80, 580,915.20 and 396,902.40

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Solution

The fourth proportional to 421,324.80, 580,915.20 and 396,902.40 is: 547,242.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,324.80 : 580,915.20 = 396,902.40 : x
  2. Step 2: Convert to fraction form
    421,324.80/580,915.20 = 396,902.40/x
  3. Step 3: Cross multiply
    421,324.80x = 580,915.20 × 396,902.40
  4. Step 4: Simplify right side
    421,324.80x = 230,566,637,076.48
  5. Step 5: Solve for x
    x = 230,566,637,076.48/421,324.80
  6. Step 6: Final answer
    x = 547,242.03

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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.