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Finding the Fourth Proportional to 21,321.58, 31,984.88 and 8,840.04

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Solution

The fourth proportional to 21,321.58, 31,984.88 and 8,840.04 is: 13,261.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,321.58 : 31,984.88 = 8,840.04 : x
  2. Step 2: Convert to fraction form
    21,321.58/31,984.88 = 8,840.04/x
  3. Step 3: Cross multiply
    21,321.58x = 31,984.88 × 8,840.04
  4. Step 4: Simplify right side
    21,321.58x = 282,747,454.45
  5. Step 5: Solve for x
    x = 282,747,454.45/21,321.58
  6. Step 6: Final answer
    x = 13,261.09

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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.