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Finding the Fourth Proportional to 439,625.80, 659,438.70 and 398,947.60

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Solution

The fourth proportional to 439,625.80, 659,438.70 and 398,947.60 is: 598,421.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,625.80 : 659,438.70 = 398,947.60 : x
  2. Step 2: Convert to fraction form
    439,625.80/659,438.70 = 398,947.60/x
  3. Step 3: Cross multiply
    439,625.80x = 659,438.70 × 398,947.60
  4. Step 4: Simplify right side
    439,625.80x = 263,081,486,712.12
  5. Step 5: Solve for x
    x = 263,081,486,712.12/439,625.80
  6. Step 6: Final answer
    x = 598,421.40

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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.