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Finding the Fourth Proportional to 28,761.48, 43,191.72 and 15,639.48

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Solution

The fourth proportional to 28,761.48, 43,191.72 and 15,639.48 is: 23,486.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,761.48 : 43,191.72 = 15,639.48 : x
  2. Step 2: Convert to fraction form
    28,761.48/43,191.72 = 15,639.48/x
  3. Step 3: Cross multiply
    28,761.48x = 43,191.72 × 15,639.48
  4. Step 4: Simplify right side
    28,761.48x = 675,496,041.11
  5. Step 5: Solve for x
    x = 675,496,041.11/28,761.48
  6. Step 6: Final answer
    x = 23,486.14

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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.