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Finding the Fourth Proportional to 492.31, 738.35 and 145.56

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Solution

The fourth proportional to 492.31, 738.35 and 145.56 is: 218.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.31 : 738.35 = 145.56 : x
  2. Step 2: Convert to fraction form
    492.31/738.35 = 145.56/x
  3. Step 3: Cross multiply
    492.31x = 738.35 × 145.56
  4. Step 4: Simplify right side
    492.31x = 107,474.23
  5. Step 5: Solve for x
    x = 107,474.23/492.31
  6. Step 6: Final answer
    x = 218.31

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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.