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Finding the Fourth Proportional to 347.36, 520.90 and 130.80

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Solution

The fourth proportional to 347.36, 520.90 and 130.80 is: 196.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.36 : 520.90 = 130.80 : x
  2. Step 2: Convert to fraction form
    347.36/520.90 = 130.80/x
  3. Step 3: Cross multiply
    347.36x = 520.90 × 130.80
  4. Step 4: Simplify right side
    347.36x = 68,133.72
  5. Step 5: Solve for x
    x = 68,133.72/347.36
  6. Step 6: Final answer
    x = 196.15

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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.