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Finding the Fourth Proportional to 128,365.74, 192,643.20 and 60,897.96

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Solution

The fourth proportional to 128,365.74, 192,643.20 and 60,897.96 is: 91,391.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,365.74 : 192,643.20 = 60,897.96 : x
  2. Step 2: Convert to fraction form
    128,365.74/192,643.20 = 60,897.96/x
  3. Step 3: Cross multiply
    128,365.74x = 192,643.20 × 60,897.96
  4. Step 4: Simplify right side
    128,365.74x = 11,731,577,887.87
  5. Step 5: Solve for x
    x = 11,731,577,887.87/128,365.74
  6. Step 6: Final answer
    x = 91,391.81

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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.