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Finding the Fourth Proportional to 557,217, 768,959.46 and 318,753

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Solution

The fourth proportional to 557,217, 768,959.46 and 318,753 is: 439,879.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    557,217 : 768,959.46 = 318,753 : x
  2. Step 2: Convert to fraction form
    557,217/768,959.46 = 318,753/x
  3. Step 3: Cross multiply
    557,217x = 768,959.46 × 318,753
  4. Step 4: Simplify right side
    557,217x = 245,108,134,753.38
  5. Step 5: Solve for x
    x = 245,108,134,753.38/557,217
  6. Step 6: Final answer
    x = 439,879.14

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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.