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Finding the Fourth Proportional to 28,376.63, 39,160.02 and 15,629.86

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Solution

The fourth proportional to 28,376.63, 39,160.02 and 15,629.86 is: 21,569.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,376.63 : 39,160.02 = 15,629.86 : x
  2. Step 2: Convert to fraction form
    28,376.63/39,160.02 = 15,629.86/x
  3. Step 3: Cross multiply
    28,376.63x = 39,160.02 × 15,629.86
  4. Step 4: Simplify right side
    28,376.63x = 612,065,591.12
  5. Step 5: Solve for x
    x = 612,065,591.12/28,376.63
  6. Step 6: Final answer
    x = 21,569.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.