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Finding the Fourth Proportional to 660,387.92, 990,022.28 and 261,310.24

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Solution

The fourth proportional to 660,387.92, 990,022.28 and 261,310.24 is: 391,743.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,387.92 : 990,022.28 = 261,310.24 : x
  2. Step 2: Convert to fraction form
    660,387.92/990,022.28 = 261,310.24/x
  3. Step 3: Cross multiply
    660,387.92x = 990,022.28 × 261,310.24
  4. Step 4: Simplify right side
    660,387.92x = 258,702,959,592.15
  5. Step 5: Solve for x
    x = 258,702,959,592.15/660,387.92
  6. Step 6: Final answer
    x = 391,743.93

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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.