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Finding the Fourth Proportional to 988.80, 1,366.43 and 890.38

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Solution

The fourth proportional to 988.80, 1,366.43 and 890.38 is: 1,230.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.80 : 1,366.43 = 890.38 : x
  2. Step 2: Convert to fraction form
    988.80/1,366.43 = 890.38/x
  3. Step 3: Cross multiply
    988.80x = 1,366.43 × 890.38
  4. Step 4: Simplify right side
    988.80x = 1,216,641.94
  5. Step 5: Solve for x
    x = 1,216,641.94/988.80
  6. Step 6: Final answer
    x = 1,230.42

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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.