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Finding the Fourth Proportional to 231.07, 346.29 and 128.13

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Solution

The fourth proportional to 231.07, 346.29 and 128.13 is: 192.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.07 : 346.29 = 128.13 : x
  2. Step 2: Convert to fraction form
    231.07/346.29 = 128.13/x
  3. Step 3: Cross multiply
    231.07x = 346.29 × 128.13
  4. Step 4: Simplify right side
    231.07x = 44,371.03
  5. Step 5: Solve for x
    x = 44,371.03/231.07
  6. Step 6: Final answer
    x = 192.02

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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.