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Finding the Fourth Proportional to 261,490.70, 391,891.39 and 103,633.02

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Solution

The fourth proportional to 261,490.70, 391,891.39 and 103,633.02 is: 155,312.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,490.70 : 391,891.39 = 103,633.02 : x
  2. Step 2: Convert to fraction form
    261,490.70/391,891.39 = 103,633.02/x
  3. Step 3: Cross multiply
    261,490.70x = 391,891.39 × 103,633.02
  4. Step 4: Simplify right side
    261,490.70x = 40,612,888,257.70
  5. Step 5: Solve for x
    x = 40,612,888,257.70/261,490.70
  6. Step 6: Final answer
    x = 155,312.94

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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.