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Finding the Fourth Proportional to 471.78, 651.05 and 261.95

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Solution

The fourth proportional to 471.78, 651.05 and 261.95 is: 361.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.78 : 651.05 = 261.95 : x
  2. Step 2: Convert to fraction form
    471.78/651.05 = 261.95/x
  3. Step 3: Cross multiply
    471.78x = 651.05 × 261.95
  4. Step 4: Simplify right side
    471.78x = 170,542.87
  5. Step 5: Solve for x
    x = 170,542.87/471.78
  6. Step 6: Final answer
    x = 361.49

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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.