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Finding the Fourth Proportional to 72,906.39, 109,359.63 and 20,317.26

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Solution

The fourth proportional to 72,906.39, 109,359.63 and 20,317.26 is: 30,475.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,906.39 : 109,359.63 = 20,317.26 : x
  2. Step 2: Convert to fraction form
    72,906.39/109,359.63 = 20,317.26/x
  3. Step 3: Cross multiply
    72,906.39x = 109,359.63 × 20,317.26
  4. Step 4: Simplify right side
    72,906.39x = 2,221,888,036.21
  5. Step 5: Solve for x
    x = 2,221,888,036.21/72,906.39
  6. Step 6: Final answer
    x = 30,475.90

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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.