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Finding the Fourth Proportional to 72,738.95, 109,108.43 and 20,148.45

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Solution

The fourth proportional to 72,738.95, 109,108.43 and 20,148.45 is: 30,222.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,738.95 : 109,108.43 = 20,148.45 : x
  2. Step 2: Convert to fraction form
    72,738.95/109,108.43 = 20,148.45/x
  3. Step 3: Cross multiply
    72,738.95x = 109,108.43 × 20,148.45
  4. Step 4: Simplify right side
    72,738.95x = 2,198,366,130.40
  5. Step 5: Solve for x
    x = 2,198,366,130.40/72,738.95
  6. Step 6: Final answer
    x = 30,222.68

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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.