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Finding the Fourth Proportional to 86,427.75, 129,641.63 and 20,763.75

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Solution

The fourth proportional to 86,427.75, 129,641.63 and 20,763.75 is: 31,145.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,427.75 : 129,641.63 = 20,763.75 : x
  2. Step 2: Convert to fraction form
    86,427.75/129,641.63 = 20,763.75/x
  3. Step 3: Cross multiply
    86,427.75x = 129,641.63 × 20,763.75
  4. Step 4: Simplify right side
    86,427.75x = 2,691,846,291.09
  5. Step 5: Solve for x
    x = 2,691,846,291.09/86,427.75
  6. Step 6: Final answer
    x = 31,145.63

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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.