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Finding the Fourth Proportional to 28,036, 42,059.76 and 11,620

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Solution

The fourth proportional to 28,036, 42,059.76 and 11,620 is: 17,432.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,036 : 42,059.76 = 11,620 : x
  2. Step 2: Convert to fraction form
    28,036/42,059.76 = 11,620/x
  3. Step 3: Cross multiply
    28,036x = 42,059.76 × 11,620
  4. Step 4: Simplify right side
    28,036x = 488,734,411.20
  5. Step 5: Solve for x
    x = 488,734,411.20/28,036
  6. Step 6: Final answer
    x = 17,432.39

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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.