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Finding the Fourth Proportional to 346.78, 520.13 and 115.66

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Solution

The fourth proportional to 346.78, 520.13 and 115.66 is: 173.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.78 : 520.13 = 115.66 : x
  2. Step 2: Convert to fraction form
    346.78/520.13 = 115.66/x
  3. Step 3: Cross multiply
    346.78x = 520.13 × 115.66
  4. Step 4: Simplify right side
    346.78x = 60,156.25
  5. Step 5: Solve for x
    x = 60,156.25/346.78
  6. Step 6: Final answer
    x = 173.47

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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.