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Finding the Fourth Proportional to 1,227.12, 1,693.62 and 729.78

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Solution

The fourth proportional to 1,227.12, 1,693.62 and 729.78 is: 1,007.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.12 : 1,693.62 = 729.78 : x
  2. Step 2: Convert to fraction form
    1,227.12/1,693.62 = 729.78/x
  3. Step 3: Cross multiply
    1,227.12x = 1,693.62 × 729.78
  4. Step 4: Simplify right side
    1,227.12x = 1,235,970.00
  5. Step 5: Solve for x
    x = 1,235,970.00/1,227.12
  6. Step 6: Final answer
    x = 1,007.21

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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.