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Finding the Fourth Proportional to 390.78, 585.99 and 116.87

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Solution

The fourth proportional to 390.78, 585.99 and 116.87 is: 175.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.78 : 585.99 = 116.87 : x
  2. Step 2: Convert to fraction form
    390.78/585.99 = 116.87/x
  3. Step 3: Cross multiply
    390.78x = 585.99 × 116.87
  4. Step 4: Simplify right side
    390.78x = 68,481.72
  5. Step 5: Solve for x
    x = 68,481.72/390.78
  6. Step 6: Final answer
    x = 175.24

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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.