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Finding the Fourth Proportional to 579,218.40, 869,410.80 and 279,939.60

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Solution

The fourth proportional to 579,218.40, 869,410.80 and 279,939.60 is: 420,191.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,218.40 : 869,410.80 = 279,939.60 : x
  2. Step 2: Convert to fraction form
    579,218.40/869,410.80 = 279,939.60/x
  3. Step 3: Cross multiply
    579,218.40x = 869,410.80 × 279,939.60
  4. Step 4: Simplify right side
    579,218.40x = 243,382,511,587.68
  5. Step 5: Solve for x
    x = 243,382,511,587.68/579,218.40
  6. Step 6: Final answer
    x = 420,191.26

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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.