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Finding the Fourth Proportional to 138,516.80, 207,256.80 and 91,860.80

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Solution

The fourth proportional to 138,516.80, 207,256.80 and 91,860.80 is: 137,447.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,516.80 : 207,256.80 = 91,860.80 : x
  2. Step 2: Convert to fraction form
    138,516.80/207,256.80 = 91,860.80/x
  3. Step 3: Cross multiply
    138,516.80x = 207,256.80 × 91,860.80
  4. Step 4: Simplify right side
    138,516.80x = 19,038,775,453.44
  5. Step 5: Solve for x
    x = 19,038,775,453.44/138,516.80
  6. Step 6: Final answer
    x = 137,447.41

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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.