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Finding the Fourth Proportional to 72,701.55, 109,054.89 and 20,115

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Solution

The fourth proportional to 72,701.55, 109,054.89 and 20,115 is: 30,173.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,701.55 : 109,054.89 = 20,115 : x
  2. Step 2: Convert to fraction form
    72,701.55/109,054.89 = 20,115/x
  3. Step 3: Cross multiply
    72,701.55x = 109,054.89 × 20,115
  4. Step 4: Simplify right side
    72,701.55x = 2,193,639,112.35
  5. Step 5: Solve for x
    x = 2,193,639,112.35/72,701.55
  6. Step 6: Final answer
    x = 30,173.21

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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.