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Finding the Fourth Proportional to 399,078.54, 550,279.71 and 326,256.30

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Solution

The fourth proportional to 399,078.54, 550,279.71 and 326,256.30 is: 449,866.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,078.54 : 550,279.71 = 326,256.30 : x
  2. Step 2: Convert to fraction form
    399,078.54/550,279.71 = 326,256.30/x
  3. Step 3: Cross multiply
    399,078.54x = 550,279.71 × 326,256.30
  4. Step 4: Simplify right side
    399,078.54x = 179,532,222,149.67
  5. Step 5: Solve for x
    x = 179,532,222,149.67/399,078.54
  6. Step 6: Final answer
    x = 449,866.89

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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.