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Finding the Fourth Proportional to 86,563.64, 129,894.77 and 69,144.18

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Solution

The fourth proportional to 86,563.64, 129,894.77 and 69,144.18 is: 103,755.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,563.64 : 129,894.77 = 69,144.18 : x
  2. Step 2: Convert to fraction form
    86,563.64/129,894.77 = 69,144.18/x
  3. Step 3: Cross multiply
    86,563.64x = 129,894.77 × 69,144.18
  4. Step 4: Simplify right side
    86,563.64x = 8,981,467,774.35
  5. Step 5: Solve for x
    x = 8,981,467,774.35/86,563.64
  6. Step 6: Final answer
    x = 103,755.67

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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.