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Finding the Fourth Proportional to 261,181.80, 391,772.70 and 128,147.40

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Solution

The fourth proportional to 261,181.80, 391,772.70 and 128,147.40 is: 192,221.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,181.80 : 391,772.70 = 128,147.40 : x
  2. Step 2: Convert to fraction form
    261,181.80/391,772.70 = 128,147.40/x
  3. Step 3: Cross multiply
    261,181.80x = 391,772.70 × 128,147.40
  4. Step 4: Simplify right side
    261,181.80x = 50,204,652,895.98
  5. Step 5: Solve for x
    x = 50,204,652,895.98/261,181.80
  6. Step 6: Final answer
    x = 192,221.10

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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.