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Finding the Fourth Proportional to 128,737.92, 193,074.56 and 61,228.30

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Solution

The fourth proportional to 128,737.92, 193,074.56 and 61,228.30 is: 91,827.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,737.92 : 193,074.56 = 61,228.30 : x
  2. Step 2: Convert to fraction form
    128,737.92/193,074.56 = 61,228.30/x
  3. Step 3: Cross multiply
    128,737.92x = 193,074.56 × 61,228.30
  4. Step 4: Simplify right side
    128,737.92x = 11,821,626,116.68
  5. Step 5: Solve for x
    x = 11,821,626,116.68/128,737.92
  6. Step 6: Final answer
    x = 91,827.07

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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.