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Finding the Fourth Proportional to 487.79, 672.68 and 291.27

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Solution

The fourth proportional to 487.79, 672.68 and 291.27 is: 401.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.79 : 672.68 = 291.27 : x
  2. Step 2: Convert to fraction form
    487.79/672.68 = 291.27/x
  3. Step 3: Cross multiply
    487.79x = 672.68 × 291.27
  4. Step 4: Simplify right side
    487.79x = 195,932.23
  5. Step 5: Solve for x
    x = 195,932.23/487.79
  6. Step 6: Final answer
    x = 401.68

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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.