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Finding the Fourth Proportional to 21,756.67, 32,649.60 and 7,905.67

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Solution

The fourth proportional to 21,756.67, 32,649.60 and 7,905.67 is: 11,863.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,756.67 : 32,649.60 = 7,905.67 : x
  2. Step 2: Convert to fraction form
    21,756.67/32,649.60 = 7,905.67/x
  3. Step 3: Cross multiply
    21,756.67x = 32,649.60 × 7,905.67
  4. Step 4: Simplify right side
    21,756.67x = 258,116,963.23
  5. Step 5: Solve for x
    x = 258,116,963.23/21,756.67
  6. Step 6: Final answer
    x = 11,863.81

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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.