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Finding the Fourth Proportional to 298.59, 447.53 and 142.20

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Solution

The fourth proportional to 298.59, 447.53 and 142.20 is: 213.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.59 : 447.53 = 142.20 : x
  2. Step 2: Convert to fraction form
    298.59/447.53 = 142.20/x
  3. Step 3: Cross multiply
    298.59x = 447.53 × 142.20
  4. Step 4: Simplify right side
    298.59x = 63,638.06
  5. Step 5: Solve for x
    x = 63,638.06/298.59
  6. Step 6: Final answer
    x = 213.13

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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.