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Finding the Fourth Proportional to 611.02, 915.85 and 379.90

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Solution

The fourth proportional to 611.02, 915.85 and 379.90 is: 569.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.02 : 915.85 = 379.90 : x
  2. Step 2: Convert to fraction form
    611.02/915.85 = 379.90/x
  3. Step 3: Cross multiply
    611.02x = 915.85 × 379.90
  4. Step 4: Simplify right side
    611.02x = 347,928.18
  5. Step 5: Solve for x
    x = 347,928.18/611.02
  6. Step 6: Final answer
    x = 569.42

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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.