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Finding the Fourth Proportional to 557,186, 768,916.68 and 318,722

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Solution

The fourth proportional to 557,186, 768,916.68 and 318,722 is: 439,836.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    557,186 : 768,916.68 = 318,722 : x
  2. Step 2: Convert to fraction form
    557,186/768,916.68 = 318,722/x
  3. Step 3: Cross multiply
    557,186x = 768,916.68 × 318,722
  4. Step 4: Simplify right side
    557,186x = 245,070,662,082.96
  5. Step 5: Solve for x
    x = 245,070,662,082.96/557,186
  6. Step 6: Final answer
    x = 439,836.36

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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.