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Finding the Fourth Proportional to 485.49, 728.94 and 321.45

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Solution

The fourth proportional to 485.49, 728.94 and 321.45 is: 482.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.49 : 728.94 = 321.45 : x
  2. Step 2: Convert to fraction form
    485.49/728.94 = 321.45/x
  3. Step 3: Cross multiply
    485.49x = 728.94 × 321.45
  4. Step 4: Simplify right side
    485.49x = 234,317.76
  5. Step 5: Solve for x
    x = 234,317.76/485.49
  6. Step 6: Final answer
    x = 482.64

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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.