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Finding the Fourth Proportional to 206,570.80, 309,856.20 and 112,092.40

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Solution

The fourth proportional to 206,570.80, 309,856.20 and 112,092.40 is: 168,138.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,570.80 : 309,856.20 = 112,092.40 : x
  2. Step 2: Convert to fraction form
    206,570.80/309,856.20 = 112,092.40/x
  3. Step 3: Cross multiply
    206,570.80x = 309,856.20 × 112,092.40
  4. Step 4: Simplify right side
    206,570.80x = 34,732,525,112.88
  5. Step 5: Solve for x
    x = 34,732,525,112.88/206,570.80
  6. Step 6: Final answer
    x = 168,138.60

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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.