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Finding the Fourth Proportional to 389.42, 537.57 and 258.54

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Solution

The fourth proportional to 389.42, 537.57 and 258.54 is: 356.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.42 : 537.57 = 258.54 : x
  2. Step 2: Convert to fraction form
    389.42/537.57 = 258.54/x
  3. Step 3: Cross multiply
    389.42x = 537.57 × 258.54
  4. Step 4: Simplify right side
    389.42x = 138,983.35
  5. Step 5: Solve for x
    x = 138,983.35/389.42
  6. Step 6: Final answer
    x = 356.90

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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.