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Finding the Fourth Proportional to 103,420.70, 155,131.05 and 67,991.30

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Solution

The fourth proportional to 103,420.70, 155,131.05 and 67,991.30 is: 101,986.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,420.70 : 155,131.05 = 67,991.30 : x
  2. Step 2: Convert to fraction form
    103,420.70/155,131.05 = 67,991.30/x
  3. Step 3: Cross multiply
    103,420.70x = 155,131.05 × 67,991.30
  4. Step 4: Simplify right side
    103,420.70x = 10,547,561,759.87
  5. Step 5: Solve for x
    x = 10,547,561,759.87/103,420.70
  6. Step 6: Final answer
    x = 101,986.95

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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.