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Finding the Fourth Proportional to 487.88, 673.28 and 291.40

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Solution

The fourth proportional to 487.88, 673.28 and 291.40 is: 402.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.88 : 673.28 = 291.40 : x
  2. Step 2: Convert to fraction form
    487.88/673.28 = 291.40/x
  3. Step 3: Cross multiply
    487.88x = 673.28 × 291.40
  4. Step 4: Simplify right side
    487.88x = 196,193.79
  5. Step 5: Solve for x
    x = 196,193.79/487.88
  6. Step 6: Final answer
    x = 402.14

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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.