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Finding the Fourth Proportional to 1,859.22, 2,790.18 and 764.28

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Solution

The fourth proportional to 1,859.22, 2,790.18 and 764.28 is: 1,146.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,859.22 : 2,790.18 = 764.28 : x
  2. Step 2: Convert to fraction form
    1,859.22/2,790.18 = 764.28/x
  3. Step 3: Cross multiply
    1,859.22x = 2,790.18 × 764.28
  4. Step 4: Simplify right side
    1,859.22x = 2,132,478.77
  5. Step 5: Solve for x
    x = 2,132,478.77/1,859.22
  6. Step 6: Final answer
    x = 1,146.97

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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.