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Finding the Fourth Proportional to 378,511.58, 522,357.64 and 217,398.93

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Solution

The fourth proportional to 378,511.58, 522,357.64 and 217,398.93 is: 300,017.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,511.58 : 522,357.64 = 217,398.93 : x
  2. Step 2: Convert to fraction form
    378,511.58/522,357.64 = 217,398.93/x
  3. Step 3: Cross multiply
    378,511.58x = 522,357.64 × 217,398.93
  4. Step 4: Simplify right side
    378,511.58x = 113,559,992,013.33
  5. Step 5: Solve for x
    x = 113,559,992,013.33/378,511.58
  6. Step 6: Final answer
    x = 300,017.22

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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.