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Finding the Fourth Proportional to 1,122.34, 1,684.71 and 636.34

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Solution

The fourth proportional to 1,122.34, 1,684.71 and 636.34 is: 955.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.34 : 1,684.71 = 636.34 : x
  2. Step 2: Convert to fraction form
    1,122.34/1,684.71 = 636.34/x
  3. Step 3: Cross multiply
    1,122.34x = 1,684.71 × 636.34
  4. Step 4: Simplify right side
    1,122.34x = 1,072,048.36
  5. Step 5: Solve for x
    x = 1,072,048.36/1,122.34
  6. Step 6: Final answer
    x = 955.19

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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.