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Finding the Fourth Proportional to 128,701.74, 192,974.56 and 57,611.28

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Solution

The fourth proportional to 128,701.74, 192,974.56 and 57,611.28 is: 86,381.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,701.74 : 192,974.56 = 57,611.28 : x
  2. Step 2: Convert to fraction form
    128,701.74/192,974.56 = 57,611.28/x
  3. Step 3: Cross multiply
    128,701.74x = 192,974.56 × 57,611.28
  4. Step 4: Simplify right side
    128,701.74x = 11,117,511,409.04
  5. Step 5: Solve for x
    x = 11,117,511,409.04/128,701.74
  6. Step 6: Final answer
    x = 86,381.98

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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.