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Finding the Fourth Proportional to 485.15, 669.33 and 275.30

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Solution

The fourth proportional to 485.15, 669.33 and 275.30 is: 379.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.15 : 669.33 = 275.30 : x
  2. Step 2: Convert to fraction form
    485.15/669.33 = 275.30/x
  3. Step 3: Cross multiply
    485.15x = 669.33 × 275.30
  4. Step 4: Simplify right side
    485.15x = 184,266.55
  5. Step 5: Solve for x
    x = 184,266.55/485.15
  6. Step 6: Final answer
    x = 379.81

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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.