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Finding the Fourth Proportional to 1,881.55, 2,822.78 and 785.31

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Solution

The fourth proportional to 1,881.55, 2,822.78 and 785.31 is: 1,178.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,881.55 : 2,822.78 = 785.31 : x
  2. Step 2: Convert to fraction form
    1,881.55/2,822.78 = 785.31/x
  3. Step 3: Cross multiply
    1,881.55x = 2,822.78 × 785.31
  4. Step 4: Simplify right side
    1,881.55x = 2,216,757.36
  5. Step 5: Solve for x
    x = 2,216,757.36/1,881.55
  6. Step 6: Final answer
    x = 1,178.15

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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.