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Finding the Fourth Proportional to 247.88, 342 and 149.60

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Solution

The fourth proportional to 247.88, 342 and 149.60 is: 206.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.88 : 342 = 149.60 : x
  2. Step 2: Convert to fraction form
    247.88/342 = 149.60/x
  3. Step 3: Cross multiply
    247.88x = 342 × 149.60
  4. Step 4: Simplify right side
    247.88x = 51,163.20
  5. Step 5: Solve for x
    x = 51,163.20/247.88
  6. Step 6: Final answer
    x = 206.40

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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.