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Finding the Fourth Proportional to 80,975.90, 121,427.40 and 31,039.40

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Solution

The fourth proportional to 80,975.90, 121,427.40 and 31,039.40 is: 46,545.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,975.90 : 121,427.40 = 31,039.40 : x
  2. Step 2: Convert to fraction form
    80,975.90/121,427.40 = 31,039.40/x
  3. Step 3: Cross multiply
    80,975.90x = 121,427.40 × 31,039.40
  4. Step 4: Simplify right side
    80,975.90x = 3,769,033,639.56
  5. Step 5: Solve for x
    x = 3,769,033,639.56/80,975.90
  6. Step 6: Final answer
    x = 46,545.13

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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.