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Finding the Fourth Proportional to 28,362.72, 42,541.52 and 8,645.92

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Solution

The fourth proportional to 28,362.72, 42,541.52 and 8,645.92 is: 12,968.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,362.72 : 42,541.52 = 8,645.92 : x
  2. Step 2: Convert to fraction form
    28,362.72/42,541.52 = 8,645.92/x
  3. Step 3: Cross multiply
    28,362.72x = 42,541.52 × 8,645.92
  4. Step 4: Simplify right side
    28,362.72x = 367,810,578.60
  5. Step 5: Solve for x
    x = 367,810,578.60/28,362.72
  6. Step 6: Final answer
    x = 12,968.10

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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.