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Finding the Fourth Proportional to 231.66, 347.36 and 85.40

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Solution

The fourth proportional to 231.66, 347.36 and 85.40 is: 128.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.66 : 347.36 = 85.40 : x
  2. Step 2: Convert to fraction form
    231.66/347.36 = 85.40/x
  3. Step 3: Cross multiply
    231.66x = 347.36 × 85.40
  4. Step 4: Simplify right side
    231.66x = 29,664.54
  5. Step 5: Solve for x
    x = 29,664.54/231.66
  6. Step 6: Final answer
    x = 128.05

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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.