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Finding the Fourth Proportional to 883.20, 1,324.80 and 638.40

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Solution

The fourth proportional to 883.20, 1,324.80 and 638.40 is: 957.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.20 : 1,324.80 = 638.40 : x
  2. Step 2: Convert to fraction form
    883.20/1,324.80 = 638.40/x
  3. Step 3: Cross multiply
    883.20x = 1,324.80 × 638.40
  4. Step 4: Simplify right side
    883.20x = 845,752.32
  5. Step 5: Solve for x
    x = 845,752.32/883.20
  6. Step 6: Final answer
    x = 957.60

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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.