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Finding the Fourth Proportional to 487.16, 672.28 and 287.96

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Solution

The fourth proportional to 487.16, 672.28 and 287.96 is: 397.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.16 : 672.28 = 287.96 : x
  2. Step 2: Convert to fraction form
    487.16/672.28 = 287.96/x
  3. Step 3: Cross multiply
    487.16x = 672.28 × 287.96
  4. Step 4: Simplify right side
    487.16x = 193,589.75
  5. Step 5: Solve for x
    x = 193,589.75/487.16
  6. Step 6: Final answer
    x = 397.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.