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Finding the Fourth Proportional to 312.88, 468.36 and 261.04

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Solution

The fourth proportional to 312.88, 468.36 and 261.04 is: 390.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.88 : 468.36 = 261.04 : x
  2. Step 2: Convert to fraction form
    312.88/468.36 = 261.04/x
  3. Step 3: Cross multiply
    312.88x = 468.36 × 261.04
  4. Step 4: Simplify right side
    312.88x = 122,260.69
  5. Step 5: Solve for x
    x = 122,260.69/312.88
  6. Step 6: Final answer
    x = 390.76

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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.