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Finding the Fourth Proportional to 390.34, 585.78 and 174.04

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Solution

The fourth proportional to 390.34, 585.78 and 174.04 is: 261.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.34 : 585.78 = 174.04 : x
  2. Step 2: Convert to fraction form
    390.34/585.78 = 174.04/x
  3. Step 3: Cross multiply
    390.34x = 585.78 × 174.04
  4. Step 4: Simplify right side
    390.34x = 101,949.15
  5. Step 5: Solve for x
    x = 101,949.15/390.34
  6. Step 6: Final answer
    x = 261.18

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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.