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Finding the Fourth Proportional to 72,928.56, 109,411.29 and 20,338.05

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Solution

The fourth proportional to 72,928.56, 109,411.29 and 20,338.05 is: 30,512.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,928.56 : 109,411.29 = 20,338.05 : x
  2. Step 2: Convert to fraction form
    72,928.56/109,411.29 = 20,338.05/x
  3. Step 3: Cross multiply
    72,928.56x = 109,411.29 × 20,338.05
  4. Step 4: Simplify right side
    72,928.56x = 2,225,212,286.58
  5. Step 5: Solve for x
    x = 2,225,212,286.58/72,928.56
  6. Step 6: Final answer
    x = 30,512.22

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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.