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Finding the Fourth Proportional to 128,640.18, 192,978.93 and 39,900.81

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Solution

The fourth proportional to 128,640.18, 192,978.93 and 39,900.81 is: 59,857.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,640.18 : 192,978.93 = 39,900.81 : x
  2. Step 2: Convert to fraction form
    128,640.18/192,978.93 = 39,900.81/x
  3. Step 3: Cross multiply
    128,640.18x = 192,978.93 × 39,900.81
  4. Step 4: Simplify right side
    128,640.18x = 7,700,015,619.93
  5. Step 5: Solve for x
    x = 7,700,015,619.93/128,640.18
  6. Step 6: Final answer
    x = 59,857.00

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.