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Finding the Fourth Proportional to 611.30, 915.90 and 379.46

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Solution

The fourth proportional to 611.30, 915.90 and 379.46 is: 568.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.30 : 915.90 = 379.46 : x
  2. Step 2: Convert to fraction form
    611.30/915.90 = 379.46/x
  3. Step 3: Cross multiply
    611.30x = 915.90 × 379.46
  4. Step 4: Simplify right side
    611.30x = 347,547.41
  5. Step 5: Solve for x
    x = 347,547.41/611.30
  6. Step 6: Final answer
    x = 568.54

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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.