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Finding the Fourth Proportional to 1,226, 1,693.32 and 811.28

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Solution

The fourth proportional to 1,226, 1,693.32 and 811.28 is: 1,120.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226 : 1,693.32 = 811.28 : x
  2. Step 2: Convert to fraction form
    1,226/1,693.32 = 811.28/x
  3. Step 3: Cross multiply
    1,226x = 1,693.32 × 811.28
  4. Step 4: Simplify right side
    1,226x = 1,373,756.65
  5. Step 5: Solve for x
    x = 1,373,756.65/1,226
  6. Step 6: Final answer
    x = 1,120.52

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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.