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Finding the Fourth Proportional to 212,617.48, 318,937.86 and 86,238.96

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Solution

The fourth proportional to 212,617.48, 318,937.86 and 86,238.96 is: 129,363.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,617.48 : 318,937.86 = 86,238.96 : x
  2. Step 2: Convert to fraction form
    212,617.48/318,937.86 = 86,238.96/x
  3. Step 3: Cross multiply
    212,617.48x = 318,937.86 × 86,238.96
  4. Step 4: Simplify right side
    212,617.48x = 27,504,869,351.03
  5. Step 5: Solve for x
    x = 27,504,869,351.03/212,617.48
  6. Step 6: Final answer
    x = 129,363.16

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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.