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Finding the Fourth Proportional to 389.97, 585.57 and 207.57

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Solution

The fourth proportional to 389.97, 585.57 and 207.57 is: 311.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.97 : 585.57 = 207.57 : x
  2. Step 2: Convert to fraction form
    389.97/585.57 = 207.57/x
  3. Step 3: Cross multiply
    389.97x = 585.57 × 207.57
  4. Step 4: Simplify right side
    389.97x = 121,546.76
  5. Step 5: Solve for x
    x = 121,546.76/389.97
  6. Step 6: Final answer
    x = 311.68

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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.