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Finding the Fourth Proportional to 66,015.96, 98,984.40 and 21,017.88

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Solution

The fourth proportional to 66,015.96, 98,984.40 and 21,017.88 is: 31,514.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,015.96 : 98,984.40 = 21,017.88 : x
  2. Step 2: Convert to fraction form
    66,015.96/98,984.40 = 21,017.88/x
  3. Step 3: Cross multiply
    66,015.96x = 98,984.40 × 21,017.88
  4. Step 4: Simplify right side
    66,015.96x = 2,080,442,162.25
  5. Step 5: Solve for x
    x = 2,080,442,162.25/66,015.96
  6. Step 6: Final answer
    x = 31,514.23

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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.