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Finding the Fourth Proportional to 86,561.40, 129,809.70 and 30,379.80

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Solution

The fourth proportional to 86,561.40, 129,809.70 and 30,379.80 is: 45,558.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,561.40 : 129,809.70 = 30,379.80 : x
  2. Step 2: Convert to fraction form
    86,561.40/129,809.70 = 30,379.80/x
  3. Step 3: Cross multiply
    86,561.40x = 129,809.70 × 30,379.80
  4. Step 4: Simplify right side
    86,561.40x = 3,943,592,724.06
  5. Step 5: Solve for x
    x = 3,943,592,724.06/86,561.40
  6. Step 6: Final answer
    x = 45,558.33

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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.