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Finding the Fourth Proportional to 72,706.51, 109,059.62 and 20,115.84

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Solution

The fourth proportional to 72,706.51, 109,059.62 and 20,115.84 is: 30,173.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,706.51 : 109,059.62 = 20,115.84 : x
  2. Step 2: Convert to fraction form
    72,706.51/109,059.62 = 20,115.84/x
  3. Step 3: Cross multiply
    72,706.51x = 109,059.62 × 20,115.84
  4. Step 4: Simplify right side
    72,706.51x = 2,193,826,174.78
  5. Step 5: Solve for x
    x = 2,193,826,174.78/72,706.51
  6. Step 6: Final answer
    x = 30,173.72

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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.