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Finding the Fourth Proportional to 491.40, 736.80 and 231.05

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Solution

The fourth proportional to 491.40, 736.80 and 231.05 is: 346.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.40 : 736.80 = 231.05 : x
  2. Step 2: Convert to fraction form
    491.40/736.80 = 231.05/x
  3. Step 3: Cross multiply
    491.40x = 736.80 × 231.05
  4. Step 4: Simplify right side
    491.40x = 170,233.96
  5. Step 5: Solve for x
    x = 170,233.96/491.40
  6. Step 6: Final answer
    x = 346.43

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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.