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Finding the Fourth Proportional to 128,480, 192,639 and 61,936.88

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Solution

The fourth proportional to 128,480, 192,639 and 61,936.88 is: 92,866.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,480 : 192,639 = 61,936.88 : x
  2. Step 2: Convert to fraction form
    128,480/192,639 = 61,936.88/x
  3. Step 3: Cross multiply
    128,480x = 192,639 × 61,936.88
  4. Step 4: Simplify right side
    128,480x = 11,931,458,626.32
  5. Step 5: Solve for x
    x = 11,931,458,626.32/128,480
  6. Step 6: Final answer
    x = 92,866.27

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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.