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Finding the Fourth Proportional to 235.15, 324.34 and 147.80

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Solution

The fourth proportional to 235.15, 324.34 and 147.80 is: 203.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.15 : 324.34 = 147.80 : x
  2. Step 2: Convert to fraction form
    235.15/324.34 = 147.80/x
  3. Step 3: Cross multiply
    235.15x = 324.34 × 147.80
  4. Step 4: Simplify right side
    235.15x = 47,937.45
  5. Step 5: Solve for x
    x = 47,937.45/235.15
  6. Step 6: Final answer
    x = 203.86

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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.