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Finding the Fourth Proportional to 438,408.80, 657,872.40 and 319,781.60

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Solution

The fourth proportional to 438,408.80, 657,872.40 and 319,781.60 is: 479,861.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,408.80 : 657,872.40 = 319,781.60 : x
  2. Step 2: Convert to fraction form
    438,408.80/657,872.40 = 319,781.60/x
  3. Step 3: Cross multiply
    438,408.80x = 657,872.40 × 319,781.60
  4. Step 4: Simplify right side
    438,408.80x = 210,375,488,667.84
  5. Step 5: Solve for x
    x = 210,375,488,667.84/438,408.80
  6. Step 6: Final answer
    x = 479,861.46

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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.