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Finding the Fourth Proportional to 103,315.15, 154,808.70 and 68,213.80

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Solution

The fourth proportional to 103,315.15, 154,808.70 and 68,213.80 is: 102,212.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,315.15 : 154,808.70 = 68,213.80 : x
  2. Step 2: Convert to fraction form
    103,315.15/154,808.70 = 68,213.80/x
  3. Step 3: Cross multiply
    103,315.15x = 154,808.70 × 68,213.80
  4. Step 4: Simplify right side
    103,315.15x = 10,560,089,700.06
  5. Step 5: Solve for x
    x = 10,560,089,700.06/103,315.15
  6. Step 6: Final answer
    x = 102,212.40

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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.