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Finding the Fourth Proportional to 399,321.20, 551,059.08 and 218,032.60

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Solution

The fourth proportional to 399,321.20, 551,059.08 and 218,032.60 is: 300,882.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,321.20 : 551,059.08 = 218,032.60 : x
  2. Step 2: Convert to fraction form
    399,321.20/551,059.08 = 218,032.60/x
  3. Step 3: Cross multiply
    399,321.20x = 551,059.08 × 218,032.60
  4. Step 4: Simplify right side
    399,321.20x = 120,148,843,966.01
  5. Step 5: Solve for x
    x = 120,148,843,966.01/399,321.20
  6. Step 6: Final answer
    x = 300,882.71

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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.