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Finding the Fourth Proportional to 988.14, 1,364.22 and 639.42

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Solution

The fourth proportional to 988.14, 1,364.22 and 639.42 is: 882.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.14 : 1,364.22 = 639.42 : x
  2. Step 2: Convert to fraction form
    988.14/1,364.22 = 639.42/x
  3. Step 3: Cross multiply
    988.14x = 1,364.22 × 639.42
  4. Step 4: Simplify right side
    988.14x = 872,309.55
  5. Step 5: Solve for x
    x = 872,309.55/988.14
  6. Step 6: Final answer
    x = 882.78

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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.