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Finding the Fourth Proportional to 103,711.88, 155,436.60 and 66,257.48

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Solution

The fourth proportional to 103,711.88, 155,436.60 and 66,257.48 is: 99,302.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,711.88 : 155,436.60 = 66,257.48 : x
  2. Step 2: Convert to fraction form
    103,711.88/155,436.60 = 66,257.48/x
  3. Step 3: Cross multiply
    103,711.88x = 155,436.60 × 66,257.48
  4. Step 4: Simplify right side
    103,711.88x = 10,298,837,415.77
  5. Step 5: Solve for x
    x = 10,298,837,415.77/103,711.88
  6. Step 6: Final answer
    x = 99,302.39

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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.