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Finding the Fourth Proportional to 1,089.74, 1,632.44 and 657.74

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Solution

The fourth proportional to 1,089.74, 1,632.44 and 657.74 is: 985.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.74 : 1,632.44 = 657.74 : x
  2. Step 2: Convert to fraction form
    1,089.74/1,632.44 = 657.74/x
  3. Step 3: Cross multiply
    1,089.74x = 1,632.44 × 657.74
  4. Step 4: Simplify right side
    1,089.74x = 1,073,721.09
  5. Step 5: Solve for x
    x = 1,073,721.09/1,089.74
  6. Step 6: Final answer
    x = 985.30

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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.