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Finding the Fourth Proportional to 389,987.68, 584,860.56 and 140,637.28

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Solution

The fourth proportional to 389,987.68, 584,860.56 and 140,637.28 is: 210,912.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,987.68 : 584,860.56 = 140,637.28 : x
  2. Step 2: Convert to fraction form
    389,987.68/584,860.56 = 140,637.28/x
  3. Step 3: Cross multiply
    389,987.68x = 584,860.56 × 140,637.28
  4. Step 4: Simplify right side
    389,987.68x = 82,253,198,337.68
  5. Step 5: Solve for x
    x = 82,253,198,337.68/389,987.68
  6. Step 6: Final answer
    x = 210,912.30

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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.