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Finding the Fourth Proportional to 347.30, 520.94 and 103.79

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Solution

The fourth proportional to 347.30, 520.94 and 103.79 is: 155.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.30 : 520.94 = 103.79 : x
  2. Step 2: Convert to fraction form
    347.30/520.94 = 103.79/x
  3. Step 3: Cross multiply
    347.30x = 520.94 × 103.79
  4. Step 4: Simplify right side
    347.30x = 54,065.76
  5. Step 5: Solve for x
    x = 54,065.76/347.30
  6. Step 6: Final answer
    x = 155.68

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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.