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Finding the Fourth Proportional to 660,657.18, 990,991.61 and 261,298

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Solution

The fourth proportional to 660,657.18, 990,991.61 and 261,298 is: 391,949.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,657.18 : 990,991.61 = 261,298 : x
  2. Step 2: Convert to fraction form
    660,657.18/990,991.61 = 261,298/x
  3. Step 3: Cross multiply
    660,657.18x = 990,991.61 × 261,298
  4. Step 4: Simplify right side
    660,657.18x = 258,944,125,709.78
  5. Step 5: Solve for x
    x = 258,944,125,709.78/660,657.18
  6. Step 6: Final answer
    x = 391,949.31

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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.