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Finding the Fourth Proportional to 21,969.84, 32,955.88 and 6,388.72

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Solution

The fourth proportional to 21,969.84, 32,955.88 and 6,388.72 is: 9,583.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,969.84 : 32,955.88 = 6,388.72 : x
  2. Step 2: Convert to fraction form
    21,969.84/32,955.88 = 6,388.72/x
  3. Step 3: Cross multiply
    21,969.84x = 32,955.88 × 6,388.72
  4. Step 4: Simplify right side
    21,969.84x = 210,545,889.67
  5. Step 5: Solve for x
    x = 210,545,889.67/21,969.84
  6. Step 6: Final answer
    x = 9,583.41

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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.