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Finding the Fourth Proportional to 68,720.20, 103,112.70 and 51,224.20

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Solution

The fourth proportional to 68,720.20, 103,112.70 and 51,224.20 is: 76,860.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,720.20 : 103,112.70 = 51,224.20 : x
  2. Step 2: Convert to fraction form
    68,720.20/103,112.70 = 51,224.20/x
  3. Step 3: Cross multiply
    68,720.20x = 103,112.70 × 51,224.20
  4. Step 4: Simplify right side
    68,720.20x = 5,281,865,567.34
  5. Step 5: Solve for x
    x = 5,281,865,567.34/68,720.20
  6. Step 6: Final answer
    x = 76,860.45

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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.