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Finding the Fourth Proportional to 385.97, 578.55 and 239.72

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Solution

The fourth proportional to 385.97, 578.55 and 239.72 is: 359.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.97 : 578.55 = 239.72 : x
  2. Step 2: Convert to fraction form
    385.97/578.55 = 239.72/x
  3. Step 3: Cross multiply
    385.97x = 578.55 × 239.72
  4. Step 4: Simplify right side
    385.97x = 138,690.01
  5. Step 5: Solve for x
    x = 138,690.01/385.97
  6. Step 6: Final answer
    x = 359.33

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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.