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Finding the Fourth Proportional to 381.98, 572.05 and 259.87

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Solution

The fourth proportional to 381.98, 572.05 and 259.87 is: 389.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.98 : 572.05 = 259.87 : x
  2. Step 2: Convert to fraction form
    381.98/572.05 = 259.87/x
  3. Step 3: Cross multiply
    381.98x = 572.05 × 259.87
  4. Step 4: Simplify right side
    381.98x = 148,658.63
  5. Step 5: Solve for x
    x = 148,658.63/381.98
  6. Step 6: Final answer
    x = 389.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.