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Finding the Fourth Proportional to 865,968.20, 1,298,721.90 and 266,928.20

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Solution

The fourth proportional to 865,968.20, 1,298,721.90 and 266,928.20 is: 400,321.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,968.20 : 1,298,721.90 = 266,928.20 : x
  2. Step 2: Convert to fraction form
    865,968.20/1,298,721.90 = 266,928.20/x
  3. Step 3: Cross multiply
    865,968.20x = 1,298,721.90 × 266,928.20
  4. Step 4: Simplify right side
    865,968.20x = 346,665,499,067.58
  5. Step 5: Solve for x
    x = 346,665,499,067.58/865,968.20
  6. Step 6: Final answer
    x = 400,321.28

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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.