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Finding the Fourth Proportional to 1,855.90, 2,561.40 and 1,069.81

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Solution

The fourth proportional to 1,855.90, 2,561.40 and 1,069.81 is: 1,476.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,855.90 : 2,561.40 = 1,069.81 : x
  2. Step 2: Convert to fraction form
    1,855.90/2,561.40 = 1,069.81/x
  3. Step 3: Cross multiply
    1,855.90x = 2,561.40 × 1,069.81
  4. Step 4: Simplify right side
    1,855.90x = 2,740,211.33
  5. Step 5: Solve for x
    x = 2,740,211.33/1,855.90
  6. Step 6: Final answer
    x = 1,476.49

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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.