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Finding the Fourth Proportional to 72,981.30, 109,472.22 and 20,390.70

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Solution

The fourth proportional to 72,981.30, 109,472.22 and 20,390.70 is: 30,586.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,981.30 : 109,472.22 = 20,390.70 : x
  2. Step 2: Convert to fraction form
    72,981.30/109,472.22 = 20,390.70/x
  3. Step 3: Cross multiply
    72,981.30x = 109,472.22 × 20,390.70
  4. Step 4: Simplify right side
    72,981.30x = 2,232,215,196.35
  5. Step 5: Solve for x
    x = 2,232,215,196.35/72,981.30
  6. Step 6: Final answer
    x = 30,586.13

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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.