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Finding the Fourth Proportional to 672.81, 1,008.40 and 287.25

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Solution

The fourth proportional to 672.81, 1,008.40 and 287.25 is: 430.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.81 : 1,008.40 = 287.25 : x
  2. Step 2: Convert to fraction form
    672.81/1,008.40 = 287.25/x
  3. Step 3: Cross multiply
    672.81x = 1,008.40 × 287.25
  4. Step 4: Simplify right side
    672.81x = 289,662.90
  5. Step 5: Solve for x
    x = 289,662.90/672.81
  6. Step 6: Final answer
    x = 430.53

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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.