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Finding the Fourth Proportional to 213,328.80, 319,906.80 and 73,015.20

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Solution

The fourth proportional to 213,328.80, 319,906.80 and 73,015.20 is: 109,493.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,328.80 : 319,906.80 = 73,015.20 : x
  2. Step 2: Convert to fraction form
    213,328.80/319,906.80 = 73,015.20/x
  3. Step 3: Cross multiply
    213,328.80x = 319,906.80 × 73,015.20
  4. Step 4: Simplify right side
    213,328.80x = 23,358,058,983.36
  5. Step 5: Solve for x
    x = 23,358,058,983.36/213,328.80
  6. Step 6: Final answer
    x = 109,493.23

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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.