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Finding the Fourth Proportional to 422,478.59, 630,644.68 and 391,256.43

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Solution

The fourth proportional to 422,478.59, 630,644.68 and 391,256.43 is: 584,038.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,478.59 : 630,644.68 = 391,256.43 : x
  2. Step 2: Convert to fraction form
    422,478.59/630,644.68 = 391,256.43/x
  3. Step 3: Cross multiply
    422,478.59x = 630,644.68 × 391,256.43
  4. Step 4: Simplify right side
    422,478.59x = 246,743,784,139.01
  5. Step 5: Solve for x
    x = 246,743,784,139.01/422,478.59
  6. Step 6: Final answer
    x = 584,038.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.