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Finding the Fourth Proportional to 128,716.95, 177,600.42 and 77,737.98

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Solution

The fourth proportional to 128,716.95, 177,600.42 and 77,737.98 is: 107,260.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,716.95 : 177,600.42 = 77,737.98 : x
  2. Step 2: Convert to fraction form
    128,716.95/177,600.42 = 77,737.98/x
  3. Step 3: Cross multiply
    128,716.95x = 177,600.42 × 77,737.98
  4. Step 4: Simplify right side
    128,716.95x = 13,806,297,897.95
  5. Step 5: Solve for x
    x = 13,806,297,897.95/128,716.95
  6. Step 6: Final answer
    x = 107,260.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.