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Finding the Fourth Proportional to 279,209.80, 418,814.70 and 172,921.60

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Solution

The fourth proportional to 279,209.80, 418,814.70 and 172,921.60 is: 259,382.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,209.80 : 418,814.70 = 172,921.60 : x
  2. Step 2: Convert to fraction form
    279,209.80/418,814.70 = 172,921.60/x
  3. Step 3: Cross multiply
    279,209.80x = 418,814.70 × 172,921.60
  4. Step 4: Simplify right side
    279,209.80x = 72,422,108,027.52
  5. Step 5: Solve for x
    x = 72,422,108,027.52/279,209.80
  6. Step 6: Final answer
    x = 259,382.40

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1.5x scale

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.