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Finding the Fourth Proportional to 247.89, 342.05 and 142.99

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Solution

The fourth proportional to 247.89, 342.05 and 142.99 is: 197.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.89 : 342.05 = 142.99 : x
  2. Step 2: Convert to fraction form
    247.89/342.05 = 142.99/x
  3. Step 3: Cross multiply
    247.89x = 342.05 × 142.99
  4. Step 4: Simplify right side
    247.89x = 48,909.23
  5. Step 5: Solve for x
    x = 48,909.23/247.89
  6. Step 6: Final answer
    x = 197.30

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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.