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Finding the Fourth Proportional to 1,089.26, 1,631.37 and 678.74

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Solution

The fourth proportional to 1,089.26, 1,631.37 and 678.74 is: 1,016.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.26 : 1,631.37 = 678.74 : x
  2. Step 2: Convert to fraction form
    1,089.26/1,631.37 = 678.74/x
  3. Step 3: Cross multiply
    1,089.26x = 1,631.37 × 678.74
  4. Step 4: Simplify right side
    1,089.26x = 1,107,276.07
  5. Step 5: Solve for x
    x = 1,107,276.07/1,089.26
  6. Step 6: Final answer
    x = 1,016.54

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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.