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Finding the Fourth Proportional to 391,896.90, 540,839.12 and 219,869.37

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Solution

The fourth proportional to 391,896.90, 540,839.12 and 219,869.37 is: 303,431.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,896.90 : 540,839.12 = 219,869.37 : x
  2. Step 2: Convert to fraction form
    391,896.90/540,839.12 = 219,869.37/x
  3. Step 3: Cross multiply
    391,896.90x = 540,839.12 × 219,869.37
  4. Step 4: Simplify right side
    391,896.90x = 118,913,955,486.41
  5. Step 5: Solve for x
    x = 118,913,955,486.41/391,896.90
  6. Step 6: Final answer
    x = 303,431.73

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1.5x scale

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.