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Finding the Fourth Proportional to 347.55, 521.01 and 128.12

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Solution

The fourth proportional to 347.55, 521.01 and 128.12 is: 192.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.55 : 521.01 = 128.12 : x
  2. Step 2: Convert to fraction form
    347.55/521.01 = 128.12/x
  3. Step 3: Cross multiply
    347.55x = 521.01 × 128.12
  4. Step 4: Simplify right side
    347.55x = 66,751.80
  5. Step 5: Solve for x
    x = 66,751.80/347.55
  6. Step 6: Final answer
    x = 192.06

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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.