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Finding the Fourth Proportional to 28,663.40, 42,981.24 and 12,018.96

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Solution

The fourth proportional to 28,663.40, 42,981.24 and 12,018.96 is: 18,022.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,663.40 : 42,981.24 = 12,018.96 : x
  2. Step 2: Convert to fraction form
    28,663.40/42,981.24 = 12,018.96/x
  3. Step 3: Cross multiply
    28,663.40x = 42,981.24 × 12,018.96
  4. Step 4: Simplify right side
    28,663.40x = 516,589,804.31
  5. Step 5: Solve for x
    x = 516,589,804.31/28,663.40
  6. Step 6: Final answer
    x = 18,022.63

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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.