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Finding the Fourth Proportional to 485.61, 728.56 and 456.60

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Solution

The fourth proportional to 485.61, 728.56 and 456.60 is: 685.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.61 : 728.56 = 456.60 : x
  2. Step 2: Convert to fraction form
    485.61/728.56 = 456.60/x
  3. Step 3: Cross multiply
    485.61x = 728.56 × 456.60
  4. Step 4: Simplify right side
    485.61x = 332,660.50
  5. Step 5: Solve for x
    x = 332,660.50/485.61
  6. Step 6: Final answer
    x = 685.04

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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.