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Finding the Fourth Proportional to 279,986.40, 419,979.60 and 210,002.40

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Solution

The fourth proportional to 279,986.40, 419,979.60 and 210,002.40 is: 315,003.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,986.40 : 419,979.60 = 210,002.40 : x
  2. Step 2: Convert to fraction form
    279,986.40/419,979.60 = 210,002.40/x
  3. Step 3: Cross multiply
    279,986.40x = 419,979.60 × 210,002.40
  4. Step 4: Simplify right side
    279,986.40x = 88,196,723,951.04
  5. Step 5: Solve for x
    x = 88,196,723,951.04/279,986.40
  6. Step 6: Final answer
    x = 315,003.60

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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.