Home / 378,971.28-522,989.90-215,618.78

Finding the Fourth Proportional to 378,971.28, 522,989.90 and 215,618.78

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Solution

The fourth proportional to 378,971.28, 522,989.90 and 215,618.78 is: 297,559.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,971.28 : 522,989.90 = 215,618.78 : x
  2. Step 2: Convert to fraction form
    378,971.28/522,989.90 = 215,618.78/x
  3. Step 3: Cross multiply
    378,971.28x = 522,989.90 × 215,618.78
  4. Step 4: Simplify right side
    378,971.28x = 112,766,444,190.32
  5. Step 5: Solve for x
    x = 112,766,444,190.32/378,971.28
  6. Step 6: Final answer
    x = 297,559.34

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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.