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Finding the Fourth Proportional to 611, 915.38 and 379.43

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Solution

The fourth proportional to 611, 915.38 and 379.43 is: 568.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    611 : 915.38 = 379.43 : x
  2. Step 2: Convert to fraction form
    611/915.38 = 379.43/x
  3. Step 3: Cross multiply
    611x = 915.38 × 379.43
  4. Step 4: Simplify right side
    611x = 347,322.63
  5. Step 5: Solve for x
    x = 347,322.63/611
  6. Step 6: Final answer
    x = 568.45

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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.