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Finding the Fourth Proportional to 485.04, 669.24 and 288.53

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Solution

The fourth proportional to 485.04, 669.24 and 288.53 is: 398.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.04 : 669.24 = 288.53 : x
  2. Step 2: Convert to fraction form
    485.04/669.24 = 288.53/x
  3. Step 3: Cross multiply
    485.04x = 669.24 × 288.53
  4. Step 4: Simplify right side
    485.04x = 193,092.47
  5. Step 5: Solve for x
    x = 193,092.47/485.04
  6. Step 6: Final answer
    x = 398.10

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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.