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Finding the Fourth Proportional to 212,720.80, 319,081.20 and 107,744.80

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Solution

The fourth proportional to 212,720.80, 319,081.20 and 107,744.80 is: 161,617.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,720.80 : 319,081.20 = 107,744.80 : x
  2. Step 2: Convert to fraction form
    212,720.80/319,081.20 = 107,744.80/x
  3. Step 3: Cross multiply
    212,720.80x = 319,081.20 × 107,744.80
  4. Step 4: Simplify right side
    212,720.80x = 34,379,340,077.76
  5. Step 5: Solve for x
    x = 34,379,340,077.76/212,720.80
  6. Step 6: Final answer
    x = 161,617.20

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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.