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Finding the Fourth Proportional to 378,690.87, 522,639.66 and 217,545.58

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Solution

The fourth proportional to 378,690.87, 522,639.66 and 217,545.58 is: 300,239.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,690.87 : 522,639.66 = 217,545.58 : x
  2. Step 2: Convert to fraction form
    378,690.87/522,639.66 = 217,545.58/x
  3. Step 3: Cross multiply
    378,690.87x = 522,639.66 × 217,545.58
  4. Step 4: Simplify right side
    378,690.87x = 113,697,947,965.70
  5. Step 5: Solve for x
    x = 113,697,947,965.70/378,690.87
  6. Step 6: Final answer
    x = 300,239.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.