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Finding the Fourth Proportional to 28,290.78, 42,435.90 and 17,200.53

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Solution

The fourth proportional to 28,290.78, 42,435.90 and 17,200.53 is: 25,800.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,290.78 : 42,435.90 = 17,200.53 : x
  2. Step 2: Convert to fraction form
    28,290.78/42,435.90 = 17,200.53/x
  3. Step 3: Cross multiply
    28,290.78x = 42,435.90 × 17,200.53
  4. Step 4: Simplify right side
    28,290.78x = 729,919,971.03
  5. Step 5: Solve for x
    x = 729,919,971.03/28,290.78
  6. Step 6: Final answer
    x = 25,800.63

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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.