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Finding the Fourth Proportional to 28,436.58, 42,660.99 and 8,716.50

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Solution

The fourth proportional to 28,436.58, 42,660.99 and 8,716.50 is: 13,076.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,436.58 : 42,660.99 = 8,716.50 : x
  2. Step 2: Convert to fraction form
    28,436.58/42,660.99 = 8,716.50/x
  3. Step 3: Cross multiply
    28,436.58x = 42,660.99 × 8,716.50
  4. Step 4: Simplify right side
    28,436.58x = 371,854,519.34
  5. Step 5: Solve for x
    x = 371,854,519.34/28,436.58
  6. Step 6: Final answer
    x = 13,076.63

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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.