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Finding the Fourth Proportional to 391,861.89, 540,828.49 and 238,988.81

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Solution

The fourth proportional to 391,861.89, 540,828.49 and 238,988.81 is: 329,840.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,861.89 : 540,828.49 = 238,988.81 : x
  2. Step 2: Convert to fraction form
    391,861.89/540,828.49 = 238,988.81/x
  3. Step 3: Cross multiply
    391,861.89x = 540,828.49 × 238,988.81
  4. Step 4: Simplify right side
    391,861.89x = 129,251,956,044.25
  5. Step 5: Solve for x
    x = 129,251,956,044.25/391,861.89
  6. Step 6: Final answer
    x = 329,840.59

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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.