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Finding the Fourth Proportional to 210,439.20, 315,658.80 and 99,847.20

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Solution

The fourth proportional to 210,439.20, 315,658.80 and 99,847.20 is: 149,770.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,439.20 : 315,658.80 = 99,847.20 : x
  2. Step 2: Convert to fraction form
    210,439.20/315,658.80 = 99,847.20/x
  3. Step 3: Cross multiply
    210,439.20x = 315,658.80 × 99,847.20
  4. Step 4: Simplify right side
    210,439.20x = 31,517,647,335.36
  5. Step 5: Solve for x
    x = 31,517,647,335.36/210,439.20
  6. Step 6: Final answer
    x = 149,770.80

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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.