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Finding the Fourth Proportional to 1,236.25, 1,706.31 and 816.69

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Solution

The fourth proportional to 1,236.25, 1,706.31 and 816.69 is: 1,127.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.25 : 1,706.31 = 816.69 : x
  2. Step 2: Convert to fraction form
    1,236.25/1,706.31 = 816.69/x
  3. Step 3: Cross multiply
    1,236.25x = 1,706.31 × 816.69
  4. Step 4: Simplify right side
    1,236.25x = 1,393,526.31
  5. Step 5: Solve for x
    x = 1,393,526.31/1,236.25
  6. Step 6: Final answer
    x = 1,127.22

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Half scale
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Double scale
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1.5x scale

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.