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Finding the Fourth Proportional to 442.76, 663.78 and 298.40

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Solution

The fourth proportional to 442.76, 663.78 and 298.40 is: 447.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.76 : 663.78 = 298.40 : x
  2. Step 2: Convert to fraction form
    442.76/663.78 = 298.40/x
  3. Step 3: Cross multiply
    442.76x = 663.78 × 298.40
  4. Step 4: Simplify right side
    442.76x = 198,071.95
  5. Step 5: Solve for x
    x = 198,071.95/442.76
  6. Step 6: Final answer
    x = 447.36

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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.