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Finding the Fourth Proportional to 607.75, 911.75 and 261.09

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Solution

The fourth proportional to 607.75, 911.75 and 261.09 is: 391.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.75 : 911.75 = 261.09 : x
  2. Step 2: Convert to fraction form
    607.75/911.75 = 261.09/x
  3. Step 3: Cross multiply
    607.75x = 911.75 × 261.09
  4. Step 4: Simplify right side
    607.75x = 238,047.50
  5. Step 5: Solve for x
    x = 238,047.50/607.75
  6. Step 6: Final answer
    x = 391.69

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1.5x scale

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.