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Finding the Fourth Proportional to 1,092.12, 1,506.78 and 678.36

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Solution

The fourth proportional to 1,092.12, 1,506.78 and 678.36 is: 935.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,092.12 : 1,506.78 = 678.36 : x
  2. Step 2: Convert to fraction form
    1,092.12/1,506.78 = 678.36/x
  3. Step 3: Cross multiply
    1,092.12x = 1,506.78 × 678.36
  4. Step 4: Simplify right side
    1,092.12x = 1,022,139.28
  5. Step 5: Solve for x
    x = 1,022,139.28/1,092.12
  6. Step 6: Final answer
    x = 935.92

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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.