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Finding the Fourth Proportional to 485.45, 728.10 and 177.26

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Solution

The fourth proportional to 485.45, 728.10 and 177.26 is: 265.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.45 : 728.10 = 177.26 : x
  2. Step 2: Convert to fraction form
    485.45/728.10 = 177.26/x
  3. Step 3: Cross multiply
    485.45x = 728.10 × 177.26
  4. Step 4: Simplify right side
    485.45x = 129,059.37
  5. Step 5: Solve for x
    x = 129,059.37/485.45
  6. Step 6: Final answer
    x = 265.86

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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.