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Finding the Fourth Proportional to 347.27, 520.91 and 103.80

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Solution

The fourth proportional to 347.27, 520.91 and 103.80 is: 155.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.27 : 520.91 = 103.80 : x
  2. Step 2: Convert to fraction form
    347.27/520.91 = 103.80/x
  3. Step 3: Cross multiply
    347.27x = 520.91 × 103.80
  4. Step 4: Simplify right side
    347.27x = 54,070.46
  5. Step 5: Solve for x
    x = 54,070.46/347.27
  6. Step 6: Final answer
    x = 155.70

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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.