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Finding the Fourth Proportional to 347.78, 521.36 and 174.20

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Solution

The fourth proportional to 347.78, 521.36 and 174.20 is: 261.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.78 : 521.36 = 174.20 : x
  2. Step 2: Convert to fraction form
    347.78/521.36 = 174.20/x
  3. Step 3: Cross multiply
    347.78x = 521.36 × 174.20
  4. Step 4: Simplify right side
    347.78x = 90,820.48
  5. Step 5: Solve for x
    x = 90,820.48/347.78
  6. Step 6: Final answer
    x = 261.15

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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.