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Finding the Fourth Proportional to 485.41, 669.81 and 275.56

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Solution

The fourth proportional to 485.41, 669.81 and 275.56 is: 380.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.41 : 669.81 = 275.56 : x
  2. Step 2: Convert to fraction form
    485.41/669.81 = 275.56/x
  3. Step 3: Cross multiply
    485.41x = 669.81 × 275.56
  4. Step 4: Simplify right side
    485.41x = 184,572.84
  5. Step 5: Solve for x
    x = 184,572.84/485.41
  6. Step 6: Final answer
    x = 380.24

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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.