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Finding the Fourth Proportional to 607.76, 911.51 and 261.25

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Solution

The fourth proportional to 607.76, 911.51 and 261.25 is: 391.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.76 : 911.51 = 261.25 : x
  2. Step 2: Convert to fraction form
    607.76/911.51 = 261.25/x
  3. Step 3: Cross multiply
    607.76x = 911.51 × 261.25
  4. Step 4: Simplify right side
    607.76x = 238,134.19
  5. Step 5: Solve for x
    x = 238,134.19/607.76
  6. Step 6: Final answer
    x = 391.83

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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.