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Finding the Fourth Proportional to 331,328.20, 497,121.90 and 120,987.40

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Solution

The fourth proportional to 331,328.20, 497,121.90 and 120,987.40 is: 181,528.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    331,328.20 : 497,121.90 = 120,987.40 : x
  2. Step 2: Convert to fraction form
    331,328.20/497,121.90 = 120,987.40/x
  3. Step 3: Cross multiply
    331,328.20x = 497,121.90 × 120,987.40
  4. Step 4: Simplify right side
    331,328.20x = 60,145,486,164.06
  5. Step 5: Solve for x
    x = 60,145,486,164.06/331,328.20
  6. Step 6: Final answer
    x = 181,528.42

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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.