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Finding the Fourth Proportional to 389,637.80, 584,310.90 and 136,820.60

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Solution

The fourth proportional to 389,637.80, 584,310.90 and 136,820.60 is: 205,179.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,637.80 : 584,310.90 = 136,820.60 : x
  2. Step 2: Convert to fraction form
    389,637.80/584,310.90 = 136,820.60/x
  3. Step 3: Cross multiply
    389,637.80x = 584,310.90 × 136,820.60
  4. Step 4: Simplify right side
    389,637.80x = 79,945,767,924.54
  5. Step 5: Solve for x
    x = 79,945,767,924.54/389,637.80
  6. Step 6: Final answer
    x = 205,179.70

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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.