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Finding the Fourth Proportional to 492.28, 678.70 and 404.92

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Solution

The fourth proportional to 492.28, 678.70 and 404.92 is: 558.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.28 : 678.70 = 404.92 : x
  2. Step 2: Convert to fraction form
    492.28/678.70 = 404.92/x
  3. Step 3: Cross multiply
    492.28x = 678.70 × 404.92
  4. Step 4: Simplify right side
    492.28x = 274,819.20
  5. Step 5: Solve for x
    x = 274,819.20/492.28
  6. Step 6: Final answer
    x = 558.26

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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.