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Finding the Fourth Proportional to 90,629.70, 135,810.90 and 65,722.20

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Solution

The fourth proportional to 90,629.70, 135,810.90 and 65,722.20 is: 98,486.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,629.70 : 135,810.90 = 65,722.20 : x
  2. Step 2: Convert to fraction form
    90,629.70/135,810.90 = 65,722.20/x
  3. Step 3: Cross multiply
    90,629.70x = 135,810.90 × 65,722.20
  4. Step 4: Simplify right side
    90,629.70x = 8,925,791,131.98
  5. Step 5: Solve for x
    x = 8,925,791,131.98/90,629.70
  6. Step 6: Final answer
    x = 98,486.38

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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.