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Finding the Fourth Proportional to 1,081.25, 1,620.51 and 691.10

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Solution

The fourth proportional to 1,081.25, 1,620.51 and 691.10 is: 1,035.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.25 : 1,620.51 = 691.10 : x
  2. Step 2: Convert to fraction form
    1,081.25/1,620.51 = 691.10/x
  3. Step 3: Cross multiply
    1,081.25x = 1,620.51 × 691.10
  4. Step 4: Simplify right side
    1,081.25x = 1,119,929.84
  5. Step 5: Solve for x
    x = 1,119,929.84/1,081.25
  6. Step 6: Final answer
    x = 1,035.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.