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Finding the Fourth Proportional to 209,995.70, 315,321.60 and 121,422.20

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Solution

The fourth proportional to 209,995.70, 315,321.60 and 121,422.20 is: 182,322.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,995.70 : 315,321.60 = 121,422.20 : x
  2. Step 2: Convert to fraction form
    209,995.70/315,321.60 = 121,422.20/x
  3. Step 3: Cross multiply
    209,995.70x = 315,321.60 × 121,422.20
  4. Step 4: Simplify right side
    209,995.70x = 38,287,042,379.52
  5. Step 5: Solve for x
    x = 38,287,042,379.52/209,995.70
  6. Step 6: Final answer
    x = 182,322.98

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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.