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Finding the Fourth Proportional to 347.20, 521.05 and 279.54

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Solution

The fourth proportional to 347.20, 521.05 and 279.54 is: 419.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.20 : 521.05 = 279.54 : x
  2. Step 2: Convert to fraction form
    347.20/521.05 = 279.54/x
  3. Step 3: Cross multiply
    347.20x = 521.05 × 279.54
  4. Step 4: Simplify right side
    347.20x = 145,651.91
  5. Step 5: Solve for x
    x = 145,651.91/347.20
  6. Step 6: Final answer
    x = 419.51

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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.