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Finding the Fourth Proportional to 607.88, 911.81 and 391.61

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Solution

The fourth proportional to 607.88, 911.81 and 391.61 is: 587.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.88 : 911.81 = 391.61 : x
  2. Step 2: Convert to fraction form
    607.88/911.81 = 391.61/x
  3. Step 3: Cross multiply
    607.88x = 911.81 × 391.61
  4. Step 4: Simplify right side
    607.88x = 357,073.91
  5. Step 5: Solve for x
    x = 357,073.91/607.88
  6. Step 6: Final answer
    x = 587.41

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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.