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Finding the Fourth Proportional to 338.88, 507.60 and 261.72

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Solution

The fourth proportional to 338.88, 507.60 and 261.72 is: 392.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.88 : 507.60 = 261.72 : x
  2. Step 2: Convert to fraction form
    338.88/507.60 = 261.72/x
  3. Step 3: Cross multiply
    338.88x = 507.60 × 261.72
  4. Step 4: Simplify right side
    338.88x = 132,849.07
  5. Step 5: Solve for x
    x = 132,849.07/338.88
  6. Step 6: Final answer
    x = 392.02

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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.