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Finding the Fourth Proportional to 206,721.40, 309,644.70 and 206,721.40

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Solution

The fourth proportional to 206,721.40, 309,644.70 and 206,721.40 is: 309,644.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,721.40 : 309,644.70 = 206,721.40 : x
  2. Step 2: Convert to fraction form
    206,721.40/309,644.70 = 206,721.40/x
  3. Step 3: Cross multiply
    206,721.40x = 309,644.70 × 206,721.40
  4. Step 4: Simplify right side
    206,721.40x = 64,010,185,886.58
  5. Step 5: Solve for x
    x = 64,010,185,886.58/206,721.40
  6. Step 6: Final answer
    x = 309,644.70

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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.