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Finding the Fourth Proportional to 1,225.84, 1,838.76 and 738.28

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Solution

The fourth proportional to 1,225.84, 1,838.76 and 738.28 is: 1,107.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.84 : 1,838.76 = 738.28 : x
  2. Step 2: Convert to fraction form
    1,225.84/1,838.76 = 738.28/x
  3. Step 3: Cross multiply
    1,225.84x = 1,838.76 × 738.28
  4. Step 4: Simplify right side
    1,225.84x = 1,357,519.73
  5. Step 5: Solve for x
    x = 1,357,519.73/1,225.84
  6. Step 6: Final answer
    x = 1,107.42

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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.