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Finding the Fourth Proportional to 391.93, 585.34 and 355.29

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Solution

The fourth proportional to 391.93, 585.34 and 355.29 is: 530.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.93 : 585.34 = 355.29 : x
  2. Step 2: Convert to fraction form
    391.93/585.34 = 355.29/x
  3. Step 3: Cross multiply
    391.93x = 585.34 × 355.29
  4. Step 4: Simplify right side
    391.93x = 207,965.45
  5. Step 5: Solve for x
    x = 207,965.45/391.93
  6. Step 6: Final answer
    x = 530.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.