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Finding the Fourth Proportional to 347.05, 520.56 and 130.78

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Solution

The fourth proportional to 347.05, 520.56 and 130.78 is: 196.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.05 : 520.56 = 130.78 : x
  2. Step 2: Convert to fraction form
    347.05/520.56 = 130.78/x
  3. Step 3: Cross multiply
    347.05x = 520.56 × 130.78
  4. Step 4: Simplify right side
    347.05x = 68,078.84
  5. Step 5: Solve for x
    x = 68,078.84/347.05
  6. Step 6: Final answer
    x = 196.16

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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.