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Finding the Fourth Proportional to 873.22, 1,205 and 480.22

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Solution

The fourth proportional to 873.22, 1,205 and 480.22 is: 662.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.22 : 1,205 = 480.22 : x
  2. Step 2: Convert to fraction form
    873.22/1,205 = 480.22/x
  3. Step 3: Cross multiply
    873.22x = 1,205 × 480.22
  4. Step 4: Simplify right side
    873.22x = 578,665.10
  5. Step 5: Solve for x
    x = 578,665.10/873.22
  6. Step 6: Final answer
    x = 662.68

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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.