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Finding the Fourth Proportional to 491.31, 736.85 and 144.56

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Solution

The fourth proportional to 491.31, 736.85 and 144.56 is: 216.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.31 : 736.85 = 144.56 : x
  2. Step 2: Convert to fraction form
    491.31/736.85 = 144.56/x
  3. Step 3: Cross multiply
    491.31x = 736.85 × 144.56
  4. Step 4: Simplify right side
    491.31x = 106,521.24
  5. Step 5: Solve for x
    x = 106,521.24/491.31
  6. Step 6: Final answer
    x = 216.81

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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.