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Finding the Fourth Proportional to 490,876.60, 677,076.72 and 318,486.60

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Solution

The fourth proportional to 490,876.60, 677,076.72 and 318,486.60 is: 439,295.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,876.60 : 677,076.72 = 318,486.60 : x
  2. Step 2: Convert to fraction form
    490,876.60/677,076.72 = 318,486.60/x
  3. Step 3: Cross multiply
    490,876.60x = 677,076.72 × 318,486.60
  4. Step 4: Simplify right side
    490,876.60x = 215,639,862,491.95
  5. Step 5: Solve for x
    x = 215,639,862,491.95/490,876.60
  6. Step 6: Final answer
    x = 439,295.46

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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.