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Finding the Fourth Proportional to 988.46, 1,364.09 and 639.75

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Solution

The fourth proportional to 988.46, 1,364.09 and 639.75 is: 882.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.46 : 1,364.09 = 639.75 : x
  2. Step 2: Convert to fraction form
    988.46/1,364.09 = 639.75/x
  3. Step 3: Cross multiply
    988.46x = 1,364.09 × 639.75
  4. Step 4: Simplify right side
    988.46x = 872,673.38
  5. Step 5: Solve for x
    x = 872,673.38/988.46
  6. Step 6: Final answer
    x = 882.87

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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.