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Finding the Fourth Proportional to 391.23, 583.55 and 356.19

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Solution

The fourth proportional to 391.23, 583.55 and 356.19 is: 531.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.23 : 583.55 = 356.19 : x
  2. Step 2: Convert to fraction form
    391.23/583.55 = 356.19/x
  3. Step 3: Cross multiply
    391.23x = 583.55 × 356.19
  4. Step 4: Simplify right side
    391.23x = 207,854.67
  5. Step 5: Solve for x
    x = 207,854.67/391.23
  6. Step 6: Final answer
    x = 531.29

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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.