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Finding the Fourth Proportional to 102,121.72, 140,926.62 and 57,409.72

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Solution

The fourth proportional to 102,121.72, 140,926.62 and 57,409.72 is: 79,224.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,121.72 : 140,926.62 = 57,409.72 : x
  2. Step 2: Convert to fraction form
    102,121.72/140,926.62 = 57,409.72/x
  3. Step 3: Cross multiply
    102,121.72x = 140,926.62 × 57,409.72
  4. Step 4: Simplify right side
    102,121.72x = 8,090,557,794.75
  5. Step 5: Solve for x
    x = 8,090,557,794.75/102,121.72
  6. Step 6: Final answer
    x = 79,224.65

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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.