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Finding the Fourth Proportional to 87,603, 120,892.68 and 47,859

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Solution

The fourth proportional to 87,603, 120,892.68 and 47,859 is: 66,045.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,603 : 120,892.68 = 47,859 : x
  2. Step 2: Convert to fraction form
    87,603/120,892.68 = 47,859/x
  3. Step 3: Cross multiply
    87,603x = 120,892.68 × 47,859
  4. Step 4: Simplify right side
    87,603x = 5,785,802,772.12
  5. Step 5: Solve for x
    x = 5,785,802,772.12/87,603
  6. Step 6: Final answer
    x = 66,045.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.