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Finding the Fourth Proportional to 1,236.02, 1,706.10 and 863

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Solution

The fourth proportional to 1,236.02, 1,706.10 and 863 is: 1,191.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.02 : 1,706.10 = 863 : x
  2. Step 2: Convert to fraction form
    1,236.02/1,706.10 = 863/x
  3. Step 3: Cross multiply
    1,236.02x = 1,706.10 × 863
  4. Step 4: Simplify right side
    1,236.02x = 1,472,364.30
  5. Step 5: Solve for x
    x = 1,472,364.30/1,236.02
  6. Step 6: Final answer
    x = 1,191.21

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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.