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Finding the Fourth Proportional to 610.75, 915.71 and 394.21

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Solution

The fourth proportional to 610.75, 915.71 and 394.21 is: 591.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.75 : 915.71 = 394.21 : x
  2. Step 2: Convert to fraction form
    610.75/915.71 = 394.21/x
  3. Step 3: Cross multiply
    610.75x = 915.71 × 394.21
  4. Step 4: Simplify right side
    610.75x = 360,977.46
  5. Step 5: Solve for x
    x = 360,977.46/610.75
  6. Step 6: Final answer
    x = 591.04

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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.