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Finding the Fourth Proportional to 257.86, 355.85 and 147.34

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Solution

The fourth proportional to 257.86, 355.85 and 147.34 is: 203.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.86 : 355.85 = 147.34 : x
  2. Step 2: Convert to fraction form
    257.86/355.85 = 147.34/x
  3. Step 3: Cross multiply
    257.86x = 355.85 × 147.34
  4. Step 4: Simplify right side
    257.86x = 52,429.20
  5. Step 5: Solve for x
    x = 52,429.20/257.86
  6. Step 6: Final answer
    x = 203.32

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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.