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Finding the Fourth Proportional to 485.46, 728.26 and 321.98

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Solution

The fourth proportional to 485.46, 728.26 and 321.98 is: 483.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.46 : 728.26 = 321.98 : x
  2. Step 2: Convert to fraction form
    485.46/728.26 = 321.98/x
  3. Step 3: Cross multiply
    485.46x = 728.26 × 321.98
  4. Step 4: Simplify right side
    485.46x = 234,480.71
  5. Step 5: Solve for x
    x = 234,480.71/485.46
  6. Step 6: Final answer
    x = 483.01

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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.