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Finding the Fourth Proportional to 347.74, 521.69 and 128.44

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Solution

The fourth proportional to 347.74, 521.69 and 128.44 is: 192.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.74 : 521.69 = 128.44 : x
  2. Step 2: Convert to fraction form
    347.74/521.69 = 128.44/x
  3. Step 3: Cross multiply
    347.74x = 521.69 × 128.44
  4. Step 4: Simplify right side
    347.74x = 67,003.66
  5. Step 5: Solve for x
    x = 67,003.66/347.74
  6. Step 6: Final answer
    x = 192.68

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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.