Home / 426,383.10-639,976.50-313,719.78

Finding the Fourth Proportional to 426,383.10, 639,976.50 and 313,719.78

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Solution

The fourth proportional to 426,383.10, 639,976.50 and 313,719.78 is: 470,875.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,383.10 : 639,976.50 = 313,719.78 : x
  2. Step 2: Convert to fraction form
    426,383.10/639,976.50 = 313,719.78/x
  3. Step 3: Cross multiply
    426,383.10x = 639,976.50 × 313,719.78
  4. Step 4: Simplify right side
    426,383.10x = 200,773,286,785.17
  5. Step 5: Solve for x
    x = 200,773,286,785.17/426,383.10
  6. Step 6: Final answer
    x = 470,875.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.