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Finding the Fourth Proportional to 485.81, 670.43 and 275.96

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Solution

The fourth proportional to 485.81, 670.43 and 275.96 is: 380.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.81 : 670.43 = 275.96 : x
  2. Step 2: Convert to fraction form
    485.81/670.43 = 275.96/x
  3. Step 3: Cross multiply
    485.81x = 670.43 × 275.96
  4. Step 4: Simplify right side
    485.81x = 185,010.48
  5. Step 5: Solve for x
    x = 185,010.48/485.81
  6. Step 6: Final answer
    x = 380.83

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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.