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Finding the Fourth Proportional to 56,395.80, 84,600.99 and 18,939.78

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Solution

The fourth proportional to 56,395.80, 84,600.99 and 18,939.78 is: 28,412.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,395.80 : 84,600.99 = 18,939.78 : x
  2. Step 2: Convert to fraction form
    56,395.80/84,600.99 = 18,939.78/x
  3. Step 3: Cross multiply
    56,395.80x = 84,600.99 × 18,939.78
  4. Step 4: Simplify right side
    56,395.80x = 1,602,324,138.38
  5. Step 5: Solve for x
    x = 1,602,324,138.38/56,395.80
  6. Step 6: Final answer
    x = 28,412.12

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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.