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Finding the Fourth Proportional to 485.65, 728.70 and 161.11

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Solution

The fourth proportional to 485.65, 728.70 and 161.11 is: 241.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.65 : 728.70 = 161.11 : x
  2. Step 2: Convert to fraction form
    485.65/728.70 = 161.11/x
  3. Step 3: Cross multiply
    485.65x = 728.70 × 161.11
  4. Step 4: Simplify right side
    485.65x = 117,400.86
  5. Step 5: Solve for x
    x = 117,400.86/485.65
  6. Step 6: Final answer
    x = 241.74

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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.