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Finding the Fourth Proportional to 72,735.84, 109,103.75 and 20,145.32

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Solution

The fourth proportional to 72,735.84, 109,103.75 and 20,145.32 is: 30,217.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,735.84 : 109,103.75 = 20,145.32 : x
  2. Step 2: Convert to fraction form
    72,735.84/109,103.75 = 20,145.32/x
  3. Step 3: Cross multiply
    72,735.84x = 109,103.75 × 20,145.32
  4. Step 4: Simplify right side
    72,735.84x = 2,197,929,956.95
  5. Step 5: Solve for x
    x = 2,197,929,956.95/72,735.84
  6. Step 6: Final answer
    x = 30,217.98

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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.