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Finding the Fourth Proportional to 660,656.18, 990,990.11 and 261,297

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Solution

The fourth proportional to 660,656.18, 990,990.11 and 261,297 is: 391,947.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,656.18 : 990,990.11 = 261,297 : x
  2. Step 2: Convert to fraction form
    660,656.18/990,990.11 = 261,297/x
  3. Step 3: Cross multiply
    660,656.18x = 990,990.11 × 261,297
  4. Step 4: Simplify right side
    660,656.18x = 258,942,743,425.91
  5. Step 5: Solve for x
    x = 258,942,743,425.91/660,656.18
  6. Step 6: Final answer
    x = 391,947.81

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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.