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Finding the Fourth Proportional to 391,651, 540,481.68 and 212,803

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Solution

The fourth proportional to 391,651, 540,481.68 and 212,803 is: 293,669.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,651 : 540,481.68 = 212,803 : x
  2. Step 2: Convert to fraction form
    391,651/540,481.68 = 212,803/x
  3. Step 3: Cross multiply
    391,651x = 540,481.68 × 212,803
  4. Step 4: Simplify right side
    391,651x = 115,016,122,949.04
  5. Step 5: Solve for x
    x = 115,016,122,949.04/391,651
  6. Step 6: Final answer
    x = 293,669.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.