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Finding the Fourth Proportional to 487.90, 673.22 and 291.38

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Solution

The fourth proportional to 487.90, 673.22 and 291.38 is: 402.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.90 : 673.22 = 291.38 : x
  2. Step 2: Convert to fraction form
    487.90/673.22 = 291.38/x
  3. Step 3: Cross multiply
    487.90x = 673.22 × 291.38
  4. Step 4: Simplify right side
    487.90x = 196,162.84
  5. Step 5: Solve for x
    x = 196,162.84/487.90
  6. Step 6: Final answer
    x = 402.06

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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.