Home / 426,947.31-640,397.88-216,579.78

Finding the Fourth Proportional to 426,947.31, 640,397.88 and 216,579.78

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Solution

The fourth proportional to 426,947.31, 640,397.88 and 216,579.78 is: 324,857.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,947.31 : 640,397.88 = 216,579.78 : x
  2. Step 2: Convert to fraction form
    426,947.31/640,397.88 = 216,579.78/x
  3. Step 3: Cross multiply
    426,947.31x = 640,397.88 × 216,579.78
  4. Step 4: Simplify right side
    426,947.31x = 138,697,231,962.87
  5. Step 5: Solve for x
    x = 138,697,231,962.87/426,947.31
  6. Step 6: Final answer
    x = 324,857.96

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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.