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Finding the Fourth Proportional to 1,217.54, 1,824.50 and 638.66

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Solution

The fourth proportional to 1,217.54, 1,824.50 and 638.66 is: 957.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.54 : 1,824.50 = 638.66 : x
  2. Step 2: Convert to fraction form
    1,217.54/1,824.50 = 638.66/x
  3. Step 3: Cross multiply
    1,217.54x = 1,824.50 × 638.66
  4. Step 4: Simplify right side
    1,217.54x = 1,165,235.17
  5. Step 5: Solve for x
    x = 1,165,235.17/1,217.54
  6. Step 6: Final answer
    x = 957.04

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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.