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Finding the Fourth Proportional to 1,226.25, 1,691.03 and 783.99

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Solution

The fourth proportional to 1,226.25, 1,691.03 and 783.99 is: 1,081.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.25 : 1,691.03 = 783.99 : x
  2. Step 2: Convert to fraction form
    1,226.25/1,691.03 = 783.99/x
  3. Step 3: Cross multiply
    1,226.25x = 1,691.03 × 783.99
  4. Step 4: Simplify right side
    1,226.25x = 1,325,746.69
  5. Step 5: Solve for x
    x = 1,325,746.69/1,226.25
  6. Step 6: Final answer
    x = 1,081.14

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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.