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Finding the Fourth Proportional to 309.12, 426.59 and 178.13

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Solution

The fourth proportional to 309.12, 426.59 and 178.13 is: 245.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.12 : 426.59 = 178.13 : x
  2. Step 2: Convert to fraction form
    309.12/426.59 = 178.13/x
  3. Step 3: Cross multiply
    309.12x = 426.59 × 178.13
  4. Step 4: Simplify right side
    309.12x = 75,986.79
  5. Step 5: Solve for x
    x = 75,986.79/309.12
  6. Step 6: Final answer
    x = 245.82

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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.