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Finding the Fourth Proportional to 1,226.02, 1,691.67 and 783.58

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Solution

The fourth proportional to 1,226.02, 1,691.67 and 783.58 is: 1,081.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.02 : 1,691.67 = 783.58 : x
  2. Step 2: Convert to fraction form
    1,226.02/1,691.67 = 783.58/x
  3. Step 3: Cross multiply
    1,226.02x = 1,691.67 × 783.58
  4. Step 4: Simplify right side
    1,226.02x = 1,325,558.78
  5. Step 5: Solve for x
    x = 1,325,558.78/1,226.02
  6. Step 6: Final answer
    x = 1,081.19

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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.