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Finding the Fourth Proportional to 672.65, 1,008.75 and 261.93

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Solution

The fourth proportional to 672.65, 1,008.75 and 261.93 is: 392.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.65 : 1,008.75 = 261.93 : x
  2. Step 2: Convert to fraction form
    672.65/1,008.75 = 261.93/x
  3. Step 3: Cross multiply
    672.65x = 1,008.75 × 261.93
  4. Step 4: Simplify right side
    672.65x = 264,226.65
  5. Step 5: Solve for x
    x = 264,226.65/672.65
  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.