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Finding the Fourth Proportional to 449,121.98, 618,215.18 and 391,659.92

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Solution

The fourth proportional to 449,121.98, 618,215.18 and 391,659.92 is: 539,118.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    449,121.98 : 618,215.18 = 391,659.92 : x
  2. Step 2: Convert to fraction form
    449,121.98/618,215.18 = 391,659.92/x
  3. Step 3: Cross multiply
    449,121.98x = 618,215.18 × 391,659.92
  4. Step 4: Simplify right side
    449,121.98x = 242,130,107,941.59
  5. Step 5: Solve for x
    x = 242,130,107,941.59/449,121.98
  6. Step 6: Final answer
    x = 539,118.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.