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Finding the Fourth Proportional to 298.60, 446.21 and 266.20

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Solution

The fourth proportional to 298.60, 446.21 and 266.20 is: 397.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.60 : 446.21 = 266.20 : x
  2. Step 2: Convert to fraction form
    298.60/446.21 = 266.20/x
  3. Step 3: Cross multiply
    298.60x = 446.21 × 266.20
  4. Step 4: Simplify right side
    298.60x = 118,781.10
  5. Step 5: Solve for x
    x = 118,781.10/298.60
  6. Step 6: Final answer
    x = 397.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.