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Finding the Fourth Proportional to 1,636.90, 2,258.97 and 938.50

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Solution

The fourth proportional to 1,636.90, 2,258.97 and 938.50 is: 1,295.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,636.90 : 2,258.97 = 938.50 : x
  2. Step 2: Convert to fraction form
    1,636.90/2,258.97 = 938.50/x
  3. Step 3: Cross multiply
    1,636.90x = 2,258.97 × 938.50
  4. Step 4: Simplify right side
    1,636.90x = 2,120,043.35
  5. Step 5: Solve for x
    x = 2,120,043.35/1,636.90
  6. Step 6: Final answer
    x = 1,295.16

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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.