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Finding the Fourth Proportional to 451.72, 677.96 and 387.15

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Solution

The fourth proportional to 451.72, 677.96 and 387.15 is: 581.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.72 : 677.96 = 387.15 : x
  2. Step 2: Convert to fraction form
    451.72/677.96 = 387.15/x
  3. Step 3: Cross multiply
    451.72x = 677.96 × 387.15
  4. Step 4: Simplify right side
    451.72x = 262,472.21
  5. Step 5: Solve for x
    x = 262,472.21/451.72
  6. Step 6: Final answer
    x = 581.05

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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.