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Finding the Fourth Proportional to 389,578.05, 584,293.28 and 136,799.15

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Solution

The fourth proportional to 389,578.05, 584,293.28 and 136,799.15 is: 205,172.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,578.05 : 584,293.28 = 136,799.15 : x
  2. Step 2: Convert to fraction form
    389,578.05/584,293.28 = 136,799.15/x
  3. Step 3: Cross multiply
    389,578.05x = 584,293.28 × 136,799.15
  4. Step 4: Simplify right side
    389,578.05x = 79,930,820,449.25
  5. Step 5: Solve for x
    x = 79,930,820,449.25/389,578.05
  6. Step 6: Final answer
    x = 205,172.80

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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.