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Finding the Fourth Proportional to 212,616.72, 318,936.72 and 86,238.20

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Solution

The fourth proportional to 212,616.72, 318,936.72 and 86,238.20 is: 129,362.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,616.72 : 318,936.72 = 86,238.20 : x
  2. Step 2: Convert to fraction form
    212,616.72/318,936.72 = 86,238.20/x
  3. Step 3: Cross multiply
    212,616.72x = 318,936.72 × 86,238.20
  4. Step 4: Simplify right side
    212,616.72x = 27,504,528,646.70
  5. Step 5: Solve for x
    x = 27,504,528,646.70/212,616.72
  6. Step 6: Final answer
    x = 129,362.02

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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.