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Finding the Fourth Proportional to 988.36, 1,363.43 and 918

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Solution

The fourth proportional to 988.36, 1,363.43 and 918 is: 1,266.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.36 : 1,363.43 = 918 : x
  2. Step 2: Convert to fraction form
    988.36/1,363.43 = 918/x
  3. Step 3: Cross multiply
    988.36x = 1,363.43 × 918
  4. Step 4: Simplify right side
    988.36x = 1,251,631.04
  5. Step 5: Solve for x
    x = 1,251,631.04/988.36
  6. Step 6: Final answer
    x = 1,266.37

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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.