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Finding the Fourth Proportional to 485.97, 728.93 and 120.75

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Solution

The fourth proportional to 485.97, 728.93 and 120.75 is: 181.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.97 : 728.93 = 120.75 : x
  2. Step 2: Convert to fraction form
    485.97/728.93 = 120.75/x
  3. Step 3: Cross multiply
    485.97x = 728.93 × 120.75
  4. Step 4: Simplify right side
    485.97x = 88,021.16
  5. Step 5: Solve for x
    x = 88,021.16/485.97
  6. Step 6: Final answer
    x = 181.13

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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.