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Finding the Fourth Proportional to 71,719.19, 107,480.37 and 45,376.78

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Solution

The fourth proportional to 71,719.19, 107,480.37 and 45,376.78 is: 68,002.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,719.19 : 107,480.37 = 45,376.78 : x
  2. Step 2: Convert to fraction form
    71,719.19/107,480.37 = 45,376.78/x
  3. Step 3: Cross multiply
    71,719.19x = 107,480.37 × 45,376.78
  4. Step 4: Simplify right side
    71,719.19x = 4,877,112,835.11
  5. Step 5: Solve for x
    x = 4,877,112,835.11/71,719.19
  6. Step 6: Final answer
    x = 68,002.90

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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.