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Finding the Fourth Proportional to 310.40, 422.40 and 310.40

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Solution

The fourth proportional to 310.40, 422.40 and 310.40 is: 422.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.40 : 422.40 = 310.40 : x
  2. Step 2: Convert to fraction form
    310.40/422.40 = 310.40/x
  3. Step 3: Cross multiply
    310.40x = 422.40 × 310.40
  4. Step 4: Simplify right side
    310.40x = 131,112.96
  5. Step 5: Solve for x
    x = 131,112.96/310.40
  6. Step 6: Final answer
    x = 422.40

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.