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Finding the Fourth Proportional to 485.28, 669.72 and 275.46

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Solution

The fourth proportional to 485.28, 669.72 and 275.46 is: 380.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.28 : 669.72 = 275.46 : x
  2. Step 2: Convert to fraction form
    485.28/669.72 = 275.46/x
  3. Step 3: Cross multiply
    485.28x = 669.72 × 275.46
  4. Step 4: Simplify right side
    485.28x = 184,481.07
  5. Step 5: Solve for x
    x = 184,481.07/485.28
  6. Step 6: Final answer
    x = 380.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.