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Finding the Fourth Proportional to 86,561.94, 119,509.50 and 66,379.98

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Solution

The fourth proportional to 86,561.94, 119,509.50 and 66,379.98 is: 91,645.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,561.94 : 119,509.50 = 66,379.98 : x
  2. Step 2: Convert to fraction form
    86,561.94/119,509.50 = 66,379.98/x
  3. Step 3: Cross multiply
    86,561.94x = 119,509.50 × 66,379.98
  4. Step 4: Simplify right side
    86,561.94x = 7,933,038,219.81
  5. Step 5: Solve for x
    x = 7,933,038,219.81/86,561.94
  6. Step 6: Final answer
    x = 91,645.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.