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Finding the Fourth Proportional to 28,243.68, 38,978.64 and 15,671.04

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Solution

The fourth proportional to 28,243.68, 38,978.64 and 15,671.04 is: 21,627.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,243.68 : 38,978.64 = 15,671.04 : x
  2. Step 2: Convert to fraction form
    28,243.68/38,978.64 = 15,671.04/x
  3. Step 3: Cross multiply
    28,243.68x = 38,978.64 × 15,671.04
  4. Step 4: Simplify right side
    28,243.68x = 610,835,826.59
  5. Step 5: Solve for x
    x = 610,835,826.59/28,243.68
  6. Step 6: Final answer
    x = 21,627.35

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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.