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Finding the Fourth Proportional to 1,118.76, 1,678.56 and 680.04

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Solution

The fourth proportional to 1,118.76, 1,678.56 and 680.04 is: 1,020.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.76 : 1,678.56 = 680.04 : x
  2. Step 2: Convert to fraction form
    1,118.76/1,678.56 = 680.04/x
  3. Step 3: Cross multiply
    1,118.76x = 1,678.56 × 680.04
  4. Step 4: Simplify right side
    1,118.76x = 1,141,487.94
  5. Step 5: Solve for x
    x = 1,141,487.94/1,118.76
  6. Step 6: Final answer
    x = 1,020.32

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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.