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Finding the Fourth Proportional to 672.57, 1,009.26 and 261.77

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Solution

The fourth proportional to 672.57, 1,009.26 and 261.77 is: 392.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.57 : 1,009.26 = 261.77 : x
  2. Step 2: Convert to fraction form
    672.57/1,009.26 = 261.77/x
  3. Step 3: Cross multiply
    672.57x = 1,009.26 × 261.77
  4. Step 4: Simplify right side
    672.57x = 264,188.94
  5. Step 5: Solve for x
    x = 264,188.94/672.57
  6. Step 6: Final answer
    x = 392.81

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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.