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Finding the Fourth Proportional to 86,619, 129,928.50 and 20,955

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Solution

The fourth proportional to 86,619, 129,928.50 and 20,955 is: 31,432.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,619 : 129,928.50 = 20,955 : x
  2. Step 2: Convert to fraction form
    86,619/129,928.50 = 20,955/x
  3. Step 3: Cross multiply
    86,619x = 129,928.50 × 20,955
  4. Step 4: Simplify right side
    86,619x = 2,722,651,717.50
  5. Step 5: Solve for x
    x = 2,722,651,717.50/86,619
  6. Step 6: Final answer
    x = 31,432.50

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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.