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Finding the Fourth Proportional to 458,398.40, 687,738.37 and 218,818.02

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Solution

The fourth proportional to 458,398.40, 687,738.37 and 218,818.02 is: 328,294.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,398.40 : 687,738.37 = 218,818.02 : x
  2. Step 2: Convert to fraction form
    458,398.40/687,738.37 = 218,818.02/x
  3. Step 3: Cross multiply
    458,398.40x = 687,738.37 × 218,818.02
  4. Step 4: Simplify right side
    458,398.40x = 150,489,548,401.43
  5. Step 5: Solve for x
    x = 150,489,548,401.43/458,398.40
  6. Step 6: Final answer
    x = 328,294.23

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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.