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Finding the Fourth Proportional to 485.73, 728.47 and 331.63

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Solution

The fourth proportional to 485.73, 728.47 and 331.63 is: 497.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.73 : 728.47 = 331.63 : x
  2. Step 2: Convert to fraction form
    485.73/728.47 = 331.63/x
  3. Step 3: Cross multiply
    485.73x = 728.47 × 331.63
  4. Step 4: Simplify right side
    485.73x = 241,579.86
  5. Step 5: Solve for x
    x = 241,579.86/485.73
  6. Step 6: Final answer
    x = 497.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.