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Finding the Fourth Proportional to 347.49, 521.04 and 128.10

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Solution

The fourth proportional to 347.49, 521.04 and 128.10 is: 192.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.49 : 521.04 = 128.10 : x
  2. Step 2: Convert to fraction form
    347.49/521.04 = 128.10/x
  3. Step 3: Cross multiply
    347.49x = 521.04 × 128.10
  4. Step 4: Simplify right side
    347.49x = 66,745.22
  5. Step 5: Solve for x
    x = 66,745.22/347.49
  6. Step 6: Final answer
    x = 192.08

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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.