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Finding the Fourth Proportional to 1,093.40, 1,639.74 and 545.43

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Solution

The fourth proportional to 1,093.40, 1,639.74 and 545.43 is: 817.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,093.40 : 1,639.74 = 545.43 : x
  2. Step 2: Convert to fraction form
    1,093.40/1,639.74 = 545.43/x
  3. Step 3: Cross multiply
    1,093.40x = 1,639.74 × 545.43
  4. Step 4: Simplify right side
    1,093.40x = 894,371.58
  5. Step 5: Solve for x
    x = 894,371.58/1,093.40
  6. Step 6: Final answer
    x = 817.97

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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.