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Finding the Fourth Proportional to 21,659.85, 32,489.94 and 7,619.97

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Solution

The fourth proportional to 21,659.85, 32,489.94 and 7,619.97 is: 11,430.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,659.85 : 32,489.94 = 7,619.97 : x
  2. Step 2: Convert to fraction form
    21,659.85/32,489.94 = 7,619.97/x
  3. Step 3: Cross multiply
    21,659.85x = 32,489.94 × 7,619.97
  4. Step 4: Simplify right side
    21,659.85x = 247,572,368.10
  5. Step 5: Solve for x
    x = 247,572,368.10/21,659.85
  6. Step 6: Final answer
    x = 11,430.01

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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.