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Finding the Fourth Proportional to 1,225.11, 1,690.21 and 805.69

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Solution

The fourth proportional to 1,225.11, 1,690.21 and 805.69 is: 1,111.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.11 : 1,690.21 = 805.69 : x
  2. Step 2: Convert to fraction form
    1,225.11/1,690.21 = 805.69/x
  3. Step 3: Cross multiply
    1,225.11x = 1,690.21 × 805.69
  4. Step 4: Simplify right side
    1,225.11x = 1,361,779.06
  5. Step 5: Solve for x
    x = 1,361,779.06/1,225.11
  6. Step 6: Final answer
    x = 1,111.56

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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.