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Finding the Fourth Proportional to 140,310.20, 210,465.30 and 81,115.40

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Solution

The fourth proportional to 140,310.20, 210,465.30 and 81,115.40 is: 121,673.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,310.20 : 210,465.30 = 81,115.40 : x
  2. Step 2: Convert to fraction form
    140,310.20/210,465.30 = 81,115.40/x
  3. Step 3: Cross multiply
    140,310.20x = 210,465.30 × 81,115.40
  4. Step 4: Simplify right side
    140,310.20x = 17,071,976,995.62
  5. Step 5: Solve for x
    x = 17,071,976,995.62/140,310.20
  6. Step 6: Final answer
    x = 121,673.10

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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.