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Finding the Fourth Proportional to 490,531.32, 676,511.73 and 318,279.60

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Solution

The fourth proportional to 490,531.32, 676,511.73 and 318,279.60 is: 438,952.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,531.32 : 676,511.73 = 318,279.60 : x
  2. Step 2: Convert to fraction form
    490,531.32/676,511.73 = 318,279.60/x
  3. Step 3: Cross multiply
    490,531.32x = 676,511.73 × 318,279.60
  4. Step 4: Simplify right side
    490,531.32x = 215,319,882,819.71
  5. Step 5: Solve for x
    x = 215,319,882,819.71/490,531.32
  6. Step 6: Final answer
    x = 438,952.36

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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.