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Finding the Fourth Proportional to 485.67, 670.31 and 275.86

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Solution

The fourth proportional to 485.67, 670.31 and 275.86 is: 380.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.67 : 670.31 = 275.86 : x
  2. Step 2: Convert to fraction form
    485.67/670.31 = 275.86/x
  3. Step 3: Cross multiply
    485.67x = 670.31 × 275.86
  4. Step 4: Simplify right side
    485.67x = 184,911.72
  5. Step 5: Solve for x
    x = 184,911.72/485.67
  6. Step 6: Final answer
    x = 380.74

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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.