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Finding the Fourth Proportional to 378,436.40, 522,485.64 and 235,391.12

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Solution

The fourth proportional to 378,436.40, 522,485.64 and 235,391.12 is: 324,991.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,436.40 : 522,485.64 = 235,391.12 : x
  2. Step 2: Convert to fraction form
    378,436.40/522,485.64 = 235,391.12/x
  3. Step 3: Cross multiply
    378,436.40x = 522,485.64 × 235,391.12
  4. Step 4: Simplify right side
    378,436.40x = 122,988,479,983.52
  5. Step 5: Solve for x
    x = 122,988,479,983.52/378,436.40
  6. Step 6: Final answer
    x = 324,991.15

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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.