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Finding the Fourth Proportional to 438,415.80, 658,314.90 and 251,791.80

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Solution

The fourth proportional to 438,415.80, 658,314.90 and 251,791.80 is: 378,084.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,415.80 : 658,314.90 = 251,791.80 : x
  2. Step 2: Convert to fraction form
    438,415.80/658,314.90 = 251,791.80/x
  3. Step 3: Cross multiply
    438,415.80x = 658,314.90 × 251,791.80
  4. Step 4: Simplify right side
    438,415.80x = 165,758,293,637.82
  5. Step 5: Solve for x
    x = 165,758,293,637.82/438,415.80
  6. Step 6: Final answer
    x = 378,084.67

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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.