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Finding the Fourth Proportional to 1,263.49, 1,891.89 and 988.29

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Solution

The fourth proportional to 1,263.49, 1,891.89 and 988.29 is: 1,479.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.49 : 1,891.89 = 988.29 : x
  2. Step 2: Convert to fraction form
    1,263.49/1,891.89 = 988.29/x
  3. Step 3: Cross multiply
    1,263.49x = 1,891.89 × 988.29
  4. Step 4: Simplify right side
    1,263.49x = 1,869,735.97
  5. Step 5: Solve for x
    x = 1,869,735.97/1,263.49
  6. Step 6: Final answer
    x = 1,479.82

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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.