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Finding the Fourth Proportional to 318,649.89, 478,046.84 and 105,417.30

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Solution

The fourth proportional to 318,649.89, 478,046.84 and 105,417.30 is: 158,149.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,649.89 : 478,046.84 = 105,417.30 : x
  2. Step 2: Convert to fraction form
    318,649.89/478,046.84 = 105,417.30/x
  3. Step 3: Cross multiply
    318,649.89x = 478,046.84 × 105,417.30
  4. Step 4: Simplify right side
    318,649.89x = 50,394,404,229.01
  5. Step 5: Solve for x
    x = 50,394,404,229.01/318,649.89
  6. Step 6: Final answer
    x = 158,149.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.