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Finding the Fourth Proportional to 21,809.55, 32,724.05 and 7,955.31

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Solution

The fourth proportional to 21,809.55, 32,724.05 and 7,955.31 is: 11,936.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,809.55 : 32,724.05 = 7,955.31 : x
  2. Step 2: Convert to fraction form
    21,809.55/32,724.05 = 7,955.31/x
  3. Step 3: Cross multiply
    21,809.55x = 32,724.05 × 7,955.31
  4. Step 4: Simplify right side
    21,809.55x = 260,329,962.21
  5. Step 5: Solve for x
    x = 260,329,962.21/21,809.55
  6. Step 6: Final answer
    x = 11,936.51

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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.