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Finding the Fourth Proportional to 1,869.80, 2,805.71 and 774.91

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Solution

The fourth proportional to 1,869.80, 2,805.71 and 774.91 is: 1,162.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,869.80 : 2,805.71 = 774.91 : x
  2. Step 2: Convert to fraction form
    1,869.80/2,805.71 = 774.91/x
  3. Step 3: Cross multiply
    1,869.80x = 2,805.71 × 774.91
  4. Step 4: Simplify right side
    1,869.80x = 2,174,172.37
  5. Step 5: Solve for x
    x = 2,174,172.37/1,869.80
  6. Step 6: Final answer
    x = 1,162.79

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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.