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Finding the Fourth Proportional to 423.40, 635.70 and 261.40

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Solution

The fourth proportional to 423.40, 635.70 and 261.40 is: 392.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.40 : 635.70 = 261.40 : x
  2. Step 2: Convert to fraction form
    423.40/635.70 = 261.40/x
  3. Step 3: Cross multiply
    423.40x = 635.70 × 261.40
  4. Step 4: Simplify right side
    423.40x = 166,171.98
  5. Step 5: Solve for x
    x = 166,171.98/423.40
  6. Step 6: Final answer
    x = 392.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.