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Finding the Fourth Proportional to 261,081.79, 391,015.44 and 253,898.47

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Solution

The fourth proportional to 261,081.79, 391,015.44 and 253,898.47 is: 380,257.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,081.79 : 391,015.44 = 253,898.47 : x
  2. Step 2: Convert to fraction form
    261,081.79/391,015.44 = 253,898.47/x
  3. Step 3: Cross multiply
    261,081.79x = 391,015.44 × 253,898.47
  4. Step 4: Simplify right side
    261,081.79x = 99,278,221,962.38
  5. Step 5: Solve for x
    x = 99,278,221,962.38/261,081.79
  6. Step 6: Final answer
    x = 380,257.17

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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.