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Finding the Fourth Proportional to 389.21, 537.23 and 258.19

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Solution

The fourth proportional to 389.21, 537.23 and 258.19 is: 356.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.21 : 537.23 = 258.19 : x
  2. Step 2: Convert to fraction form
    389.21/537.23 = 258.19/x
  3. Step 3: Cross multiply
    389.21x = 537.23 × 258.19
  4. Step 4: Simplify right side
    389.21x = 138,706.72
  5. Step 5: Solve for x
    x = 138,706.72/389.21
  6. Step 6: Final answer
    x = 356.38

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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.