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Finding the Fourth Proportional to 660,641.19, 990,611.87 and 261,265.83

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Solution

The fourth proportional to 660,641.19, 990,611.87 and 261,265.83 is: 391,760.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,641.19 : 990,611.87 = 261,265.83 : x
  2. Step 2: Convert to fraction form
    660,641.19/990,611.87 = 261,265.83/x
  3. Step 3: Cross multiply
    660,641.19x = 990,611.87 × 261,265.83
  4. Step 4: Simplify right side
    660,641.19x = 258,813,031,117.07
  5. Step 5: Solve for x
    x = 258,813,031,117.07/660,641.19
  6. Step 6: Final answer
    x = 391,760.36

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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.