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Finding the Fourth Proportional to 671.90, 1,007.84 and 261.02

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Solution

The fourth proportional to 671.90, 1,007.84 and 261.02 is: 391.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.90 : 1,007.84 = 261.02 : x
  2. Step 2: Convert to fraction form
    671.90/1,007.84 = 261.02/x
  3. Step 3: Cross multiply
    671.90x = 1,007.84 × 261.02
  4. Step 4: Simplify right side
    671.90x = 263,069.57
  5. Step 5: Solve for x
    x = 263,069.57/671.90
  6. Step 6: Final answer
    x = 391.53

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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.