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Finding the Fourth Proportional to 72,940.77, 109,417.28 and 20,350.89

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Solution

The fourth proportional to 72,940.77, 109,417.28 and 20,350.89 is: 30,528.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,940.77 : 109,417.28 = 20,350.89 : x
  2. Step 2: Convert to fraction form
    72,940.77/109,417.28 = 20,350.89/x
  3. Step 3: Cross multiply
    72,940.77x = 109,417.28 × 20,350.89
  4. Step 4: Simplify right side
    72,940.77x = 2,226,738,927.62
  5. Step 5: Solve for x
    x = 2,226,738,927.62/72,940.77
  6. Step 6: Final answer
    x = 30,528.04

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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.