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Finding the Fourth Proportional to 28,443.61, 42,669.87 and 8,720.11

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Solution

The fourth proportional to 28,443.61, 42,669.87 and 8,720.11 is: 13,081.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,443.61 : 42,669.87 = 8,720.11 : x
  2. Step 2: Convert to fraction form
    28,443.61/42,669.87 = 8,720.11/x
  3. Step 3: Cross multiply
    28,443.61x = 42,669.87 × 8,720.11
  4. Step 4: Simplify right side
    28,443.61x = 372,085,960.09
  5. Step 5: Solve for x
    x = 372,085,960.09/28,443.61
  6. Step 6: Final answer
    x = 13,081.53

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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.