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Finding the Fourth Proportional to 1,228.74, 1,696.25 and 786.90

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Solution

The fourth proportional to 1,228.74, 1,696.25 and 786.90 is: 1,086.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.74 : 1,696.25 = 786.90 : x
  2. Step 2: Convert to fraction form
    1,228.74/1,696.25 = 786.90/x
  3. Step 3: Cross multiply
    1,228.74x = 1,696.25 × 786.90
  4. Step 4: Simplify right side
    1,228.74x = 1,334,779.13
  5. Step 5: Solve for x
    x = 1,334,779.13/1,228.74
  6. Step 6: Final answer
    x = 1,086.30

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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.