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Finding the Fourth Proportional to 1,236.95, 1,705.49 and 817.17

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Solution

The fourth proportional to 1,236.95, 1,705.49 and 817.17 is: 1,126.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.95 : 1,705.49 = 817.17 : x
  2. Step 2: Convert to fraction form
    1,236.95/1,705.49 = 817.17/x
  3. Step 3: Cross multiply
    1,236.95x = 1,705.49 × 817.17
  4. Step 4: Simplify right side
    1,236.95x = 1,393,675.26
  5. Step 5: Solve for x
    x = 1,393,675.26/1,236.95
  6. Step 6: Final answer
    x = 1,126.70

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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.