Home / 86,858.12-129,991.32-72,834

Finding the Fourth Proportional to 86,858.12, 129,991.32 and 72,834

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Solution

The fourth proportional to 86,858.12, 129,991.32 and 72,834 is: 109,002.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,858.12 : 129,991.32 = 72,834 : x
  2. Step 2: Convert to fraction form
    86,858.12/129,991.32 = 72,834/x
  3. Step 3: Cross multiply
    86,858.12x = 129,991.32 × 72,834
  4. Step 4: Simplify right side
    86,858.12x = 9,467,787,800.88
  5. Step 5: Solve for x
    x = 9,467,787,800.88/86,858.12
  6. Step 6: Final answer
    x = 109,002.92

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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.