Home / 378,128.60-521,785.34-216,980.18

Finding the Fourth Proportional to 378,128.60, 521,785.34 and 216,980.18

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Solution

The fourth proportional to 378,128.60, 521,785.34 and 216,980.18 is: 299,414.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,128.60 : 521,785.34 = 216,980.18 : x
  2. Step 2: Convert to fraction form
    378,128.60/521,785.34 = 216,980.18/x
  3. Step 3: Cross multiply
    378,128.60x = 521,785.34 × 216,980.18
  4. Step 4: Simplify right side
    378,128.60x = 113,217,073,300.73
  5. Step 5: Solve for x
    x = 113,217,073,300.73/378,128.60
  6. Step 6: Final answer
    x = 299,414.21

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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.