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Finding the Fourth Proportional to 485.79, 670.35 and 275.97

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Solution

The fourth proportional to 485.79, 670.35 and 275.97 is: 380.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.79 : 670.35 = 275.97 : x
  2. Step 2: Convert to fraction form
    485.79/670.35 = 275.97/x
  3. Step 3: Cross multiply
    485.79x = 670.35 × 275.97
  4. Step 4: Simplify right side
    485.79x = 184,996.49
  5. Step 5: Solve for x
    x = 184,996.49/485.79
  6. Step 6: Final answer
    x = 380.82

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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.