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Finding the Fourth Proportional to 438,697.80, 658,046.70 and 398,019.60

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Solution

The fourth proportional to 438,697.80, 658,046.70 and 398,019.60 is: 597,029.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,697.80 : 658,046.70 = 398,019.60 : x
  2. Step 2: Convert to fraction form
    438,697.80/658,046.70 = 398,019.60/x
  3. Step 3: Cross multiply
    438,697.80x = 658,046.70 × 398,019.60
  4. Step 4: Simplify right side
    438,697.80x = 261,915,484,315.32
  5. Step 5: Solve for x
    x = 261,915,484,315.32/438,697.80
  6. Step 6: Final answer
    x = 597,029.40

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Similar ratio
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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.