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Finding the Fourth Proportional to 607.89, 912.19 and 261.21

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Solution

The fourth proportional to 607.89, 912.19 and 261.21 is: 391.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.89 : 912.19 = 261.21 : x
  2. Step 2: Convert to fraction form
    607.89/912.19 = 261.21/x
  3. Step 3: Cross multiply
    607.89x = 912.19 × 261.21
  4. Step 4: Simplify right side
    607.89x = 238,273.15
  5. Step 5: Solve for x
    x = 238,273.15/607.89
  6. Step 6: Final answer
    x = 391.97

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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.