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Finding the Fourth Proportional to 326,938.60, 490,407.90 and 169,215.40

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Solution

The fourth proportional to 326,938.60, 490,407.90 and 169,215.40 is: 253,823.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,938.60 : 490,407.90 = 169,215.40 : x
  2. Step 2: Convert to fraction form
    326,938.60/490,407.90 = 169,215.40/x
  3. Step 3: Cross multiply
    326,938.60x = 490,407.90 × 169,215.40
  4. Step 4: Simplify right side
    326,938.60x = 82,984,568,961.66
  5. Step 5: Solve for x
    x = 82,984,568,961.66/326,938.60
  6. Step 6: Final answer
    x = 253,823.10

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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.