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Finding the Fourth Proportional to 611.39, 915.50 and 405.34

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Solution

The fourth proportional to 611.39, 915.50 and 405.34 is: 606.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.39 : 915.50 = 405.34 : x
  2. Step 2: Convert to fraction form
    611.39/915.50 = 405.34/x
  3. Step 3: Cross multiply
    611.39x = 915.50 × 405.34
  4. Step 4: Simplify right side
    611.39x = 371,087.49
  5. Step 5: Solve for x
    x = 371,087.49/611.39
  6. Step 6: Final answer
    x = 606.95

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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.