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Finding the Fourth Proportional to 1,127.66, 1,691.50 and 855.44

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Solution

The fourth proportional to 1,127.66, 1,691.50 and 855.44 is: 1,283.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.66 : 1,691.50 = 855.44 : x
  2. Step 2: Convert to fraction form
    1,127.66/1,691.50 = 855.44/x
  3. Step 3: Cross multiply
    1,127.66x = 1,691.50 × 855.44
  4. Step 4: Simplify right side
    1,127.66x = 1,446,969.37
  5. Step 5: Solve for x
    x = 1,446,969.37/1,127.66
  6. Step 6: Final answer
    x = 1,283.16

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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.