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Finding the Fourth Proportional to 378,689.87, 522,638.28 and 217,544.58

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Solution

The fourth proportional to 378,689.87, 522,638.28 and 217,544.58 is: 300,238.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,689.87 : 522,638.28 = 217,544.58 : x
  2. Step 2: Convert to fraction form
    378,689.87/522,638.28 = 217,544.58/x
  3. Step 3: Cross multiply
    378,689.87x = 522,638.28 × 217,544.58
  4. Step 4: Simplify right side
    378,689.87x = 113,697,125,114.52
  5. Step 5: Solve for x
    x = 113,697,125,114.52/378,689.87
  6. Step 6: Final answer
    x = 300,238.09

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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.