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Finding the Fourth Proportional to 672.13, 1,007.93 and 261.21

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Solution

The fourth proportional to 672.13, 1,007.93 and 261.21 is: 391.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.13 : 1,007.93 = 261.21 : x
  2. Step 2: Convert to fraction form
    672.13/1,007.93 = 261.21/x
  3. Step 3: Cross multiply
    672.13x = 1,007.93 × 261.21
  4. Step 4: Simplify right side
    672.13x = 263,281.40
  5. Step 5: Solve for x
    x = 263,281.40/672.13
  6. Step 6: Final answer
    x = 391.71

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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.