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Finding the Fourth Proportional to 390.25, 585.17 and 143.44

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Solution

The fourth proportional to 390.25, 585.17 and 143.44 is: 215.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.25 : 585.17 = 143.44 : x
  2. Step 2: Convert to fraction form
    390.25/585.17 = 143.44/x
  3. Step 3: Cross multiply
    390.25x = 585.17 × 143.44
  4. Step 4: Simplify right side
    390.25x = 83,936.78
  5. Step 5: Solve for x
    x = 83,936.78/390.25
  6. Step 6: Final answer
    x = 215.08

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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.