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Finding the Fourth Proportional to 391,943.34, 587,915.28 and 258,792.30

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Solution

The fourth proportional to 391,943.34, 587,915.28 and 258,792.30 is: 388,188.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,943.34 : 587,915.28 = 258,792.30 : x
  2. Step 2: Convert to fraction form
    391,943.34/587,915.28 = 258,792.30/x
  3. Step 3: Cross multiply
    391,943.34x = 587,915.28 × 258,792.30
  4. Step 4: Simplify right side
    391,943.34x = 152,147,947,516.34
  5. Step 5: Solve for x
    x = 152,147,947,516.34/391,943.34
  6. Step 6: Final answer
    x = 388,188.63

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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.