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Finding the Fourth Proportional to 315, 434.34 and 240.30

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Solution

The fourth proportional to 315, 434.34 and 240.30 is: 331.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    315 : 434.34 = 240.30 : x
  2. Step 2: Convert to fraction form
    315/434.34 = 240.30/x
  3. Step 3: Cross multiply
    315x = 434.34 × 240.30
  4. Step 4: Simplify right side
    315x = 104,371.90
  5. Step 5: Solve for x
    x = 104,371.90/315
  6. Step 6: Final answer
    x = 331.34

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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.