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Finding the Fourth Proportional to 28,425.34, 42,638.28 and 10,891

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Solution

The fourth proportional to 28,425.34, 42,638.28 and 10,891 is: 16,336.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,425.34 : 42,638.28 = 10,891 : x
  2. Step 2: Convert to fraction form
    28,425.34/42,638.28 = 10,891/x
  3. Step 3: Cross multiply
    28,425.34x = 42,638.28 × 10,891
  4. Step 4: Simplify right side
    28,425.34x = 464,373,507.48
  5. Step 5: Solve for x
    x = 464,373,507.48/28,425.34
  6. Step 6: Final answer
    x = 16,336.60

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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.