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Finding the Fourth Proportional to 485.01, 669.30 and 275.21

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Solution

The fourth proportional to 485.01, 669.30 and 275.21 is: 379.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.01 : 669.30 = 275.21 : x
  2. Step 2: Convert to fraction form
    485.01/669.30 = 275.21/x
  3. Step 3: Cross multiply
    485.01x = 669.30 × 275.21
  4. Step 4: Simplify right side
    485.01x = 184,194.71
  5. Step 5: Solve for x
    x = 184,194.71/485.01
  6. Step 6: Final answer
    x = 379.78

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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.