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Finding the Fourth Proportional to 261,087.48, 391,479.96 and 139,357.68

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Solution

The fourth proportional to 261,087.48, 391,479.96 and 139,357.68 is: 208,955.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,087.48 : 391,479.96 = 139,357.68 : x
  2. Step 2: Convert to fraction form
    261,087.48/391,479.96 = 139,357.68/x
  3. Step 3: Cross multiply
    261,087.48x = 391,479.96 × 139,357.68
  4. Step 4: Simplify right side
    261,087.48x = 54,555,738,992.09
  5. Step 5: Solve for x
    x = 54,555,738,992.09/261,087.48
  6. Step 6: Final answer
    x = 208,955.78

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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.