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Finding the Fourth Proportional to 391.23, 539.66 and 342.23

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Solution

The fourth proportional to 391.23, 539.66 and 342.23 is: 472.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.23 : 539.66 = 342.23 : x
  2. Step 2: Convert to fraction form
    391.23/539.66 = 342.23/x
  3. Step 3: Cross multiply
    391.23x = 539.66 × 342.23
  4. Step 4: Simplify right side
    391.23x = 184,686.00
  5. Step 5: Solve for x
    x = 184,686.00/391.23
  6. Step 6: Final answer
    x = 472.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.