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Finding the Fourth Proportional to 399,218.40, 598,910.80 and 133,061.60

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Solution

The fourth proportional to 399,218.40, 598,910.80 and 133,061.60 is: 199,620.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,218.40 : 598,910.80 = 133,061.60 : x
  2. Step 2: Convert to fraction form
    399,218.40/598,910.80 = 133,061.60/x
  3. Step 3: Cross multiply
    399,218.40x = 598,910.80 × 133,061.60
  4. Step 4: Simplify right side
    399,218.40x = 79,692,029,305.28
  5. Step 5: Solve for x
    x = 79,692,029,305.28/399,218.40
  6. Step 6: Final answer
    x = 199,620.13

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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.