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Finding the Fourth Proportional to 309.42, 426.76 and 247.17

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Solution

The fourth proportional to 309.42, 426.76 and 247.17 is: 340.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.42 : 426.76 = 247.17 : x
  2. Step 2: Convert to fraction form
    309.42/426.76 = 247.17/x
  3. Step 3: Cross multiply
    309.42x = 426.76 × 247.17
  4. Step 4: Simplify right side
    309.42x = 105,482.27
  5. Step 5: Solve for x
    x = 105,482.27/309.42
  6. Step 6: Final answer
    x = 340.90

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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.