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Finding the Fourth Proportional to 1,120.10, 1,678.26 and 681.08

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Solution

The fourth proportional to 1,120.10, 1,678.26 and 681.08 is: 1,020.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.10 : 1,678.26 = 681.08 : x
  2. Step 2: Convert to fraction form
    1,120.10/1,678.26 = 681.08/x
  3. Step 3: Cross multiply
    1,120.10x = 1,678.26 × 681.08
  4. Step 4: Simplify right side
    1,120.10x = 1,143,029.32
  5. Step 5: Solve for x
    x = 1,143,029.32/1,120.10
  6. Step 6: Final answer
    x = 1,020.47

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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.