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Finding the Fourth Proportional to 349.52, 526.31 and 258.85

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Solution

The fourth proportional to 349.52, 526.31 and 258.85 is: 389.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.52 : 526.31 = 258.85 : x
  2. Step 2: Convert to fraction form
    349.52/526.31 = 258.85/x
  3. Step 3: Cross multiply
    349.52x = 526.31 × 258.85
  4. Step 4: Simplify right side
    349.52x = 136,234.67
  5. Step 5: Solve for x
    x = 136,234.67/349.52
  6. Step 6: Final answer
    x = 389.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.