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Finding the Fourth Proportional to 21,378.35, 32,071.66 and 8,891.66

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Solution

The fourth proportional to 21,378.35, 32,071.66 and 8,891.66 is: 13,339.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,378.35 : 32,071.66 = 8,891.66 : x
  2. Step 2: Convert to fraction form
    21,378.35/32,071.66 = 8,891.66/x
  3. Step 3: Cross multiply
    21,378.35x = 32,071.66 × 8,891.66
  4. Step 4: Simplify right side
    21,378.35x = 285,170,354.31
  5. Step 5: Solve for x
    x = 285,170,354.31/21,378.35
  6. Step 6: Final answer
    x = 13,339.21

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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.