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Finding the Fourth Proportional to 438,401.80, 658,293.90 and 251,777.80

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Solution

The fourth proportional to 438,401.80, 658,293.90 and 251,777.80 is: 378,063.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,401.80 : 658,293.90 = 251,777.80 : x
  2. Step 2: Convert to fraction form
    438,401.80/658,293.90 = 251,777.80/x
  3. Step 3: Cross multiply
    438,401.80x = 658,293.90 × 251,777.80
  4. Step 4: Simplify right side
    438,401.80x = 165,743,789,895.42
  5. Step 5: Solve for x
    x = 165,743,789,895.42/438,401.80
  6. Step 6: Final answer
    x = 378,063.66

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1.5x scale

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.