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Finding the Fourth Proportional to 71,999.70, 107,999.55 and 68,719.20

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Solution

The fourth proportional to 71,999.70, 107,999.55 and 68,719.20 is: 103,078.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,999.70 : 107,999.55 = 68,719.20 : x
  2. Step 2: Convert to fraction form
    71,999.70/107,999.55 = 68,719.20/x
  3. Step 3: Cross multiply
    71,999.70x = 107,999.55 × 68,719.20
  4. Step 4: Simplify right side
    71,999.70x = 7,421,642,676.36
  5. Step 5: Solve for x
    x = 7,421,642,676.36/71,999.70
  6. Step 6: Final answer
    x = 103,078.80

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1.5x scale

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.