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Finding the Fourth Proportional to 247.86, 342.02 and 142.90

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Solution

The fourth proportional to 247.86, 342.02 and 142.90 is: 197.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.86 : 342.02 = 142.90 : x
  2. Step 2: Convert to fraction form
    247.86/342.02 = 142.90/x
  3. Step 3: Cross multiply
    247.86x = 342.02 × 142.90
  4. Step 4: Simplify right side
    247.86x = 48,874.16
  5. Step 5: Solve for x
    x = 48,874.16/247.86
  6. Step 6: Final answer
    x = 197.18

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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.