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Finding the Fourth Proportional to 485.06, 669.47 and 288.55

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Solution

The fourth proportional to 485.06, 669.47 and 288.55 is: 398.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.06 : 669.47 = 288.55 : x
  2. Step 2: Convert to fraction form
    485.06/669.47 = 288.55/x
  3. Step 3: Cross multiply
    485.06x = 669.47 × 288.55
  4. Step 4: Simplify right side
    485.06x = 193,170.78
  5. Step 5: Solve for x
    x = 193,170.78/485.06
  6. Step 6: Final answer
    x = 398.24

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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.