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Finding the Fourth Proportional to 451.92, 677.90 and 143.78

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Solution

The fourth proportional to 451.92, 677.90 and 143.78 is: 215.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.92 : 677.90 = 143.78 : x
  2. Step 2: Convert to fraction form
    451.92/677.90 = 143.78/x
  3. Step 3: Cross multiply
    451.92x = 677.90 × 143.78
  4. Step 4: Simplify right side
    451.92x = 97,468.46
  5. Step 5: Solve for x
    x = 97,468.46/451.92
  6. Step 6: Final answer
    x = 215.68

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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.