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Finding the Fourth Proportional to 390.33, 585.05 and 170.89

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Solution

The fourth proportional to 390.33, 585.05 and 170.89 is: 256.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.33 : 585.05 = 170.89 : x
  2. Step 2: Convert to fraction form
    390.33/585.05 = 170.89/x
  3. Step 3: Cross multiply
    390.33x = 585.05 × 170.89
  4. Step 4: Simplify right side
    390.33x = 99,976.88
  5. Step 5: Solve for x
    x = 99,976.88/390.33
  6. Step 6: Final answer
    x = 256.13

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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.