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Finding the Fourth Proportional to 1,855.32, 2,781.51 and 930.39

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Solution

The fourth proportional to 1,855.32, 2,781.51 and 930.39 is: 1,394.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,855.32 : 2,781.51 = 930.39 : x
  2. Step 2: Convert to fraction form
    1,855.32/2,781.51 = 930.39/x
  3. Step 3: Cross multiply
    1,855.32x = 2,781.51 × 930.39
  4. Step 4: Simplify right side
    1,855.32x = 2,587,889.09
  5. Step 5: Solve for x
    x = 2,587,889.09/1,855.32
  6. Step 6: Final answer
    x = 1,394.85

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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.