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Finding the Fourth Proportional to 485.38, 669.86 and 275.58

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Solution

The fourth proportional to 485.38, 669.86 and 275.58 is: 380.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.38 : 669.86 = 275.58 : x
  2. Step 2: Convert to fraction form
    485.38/669.86 = 275.58/x
  3. Step 3: Cross multiply
    485.38x = 669.86 × 275.58
  4. Step 4: Simplify right side
    485.38x = 184,600.02
  5. Step 5: Solve for x
    x = 184,600.02/485.38
  6. Step 6: Final answer
    x = 380.32

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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.