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Finding the Fourth Proportional to 21,900.14, 32,866.06 and 8,756.28

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Solution

The fourth proportional to 21,900.14, 32,866.06 and 8,756.28 is: 13,140.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,900.14 : 32,866.06 = 8,756.28 : x
  2. Step 2: Convert to fraction form
    21,900.14/32,866.06 = 8,756.28/x
  3. Step 3: Cross multiply
    21,900.14x = 32,866.06 × 8,756.28
  4. Step 4: Simplify right side
    21,900.14x = 287,784,423.86
  5. Step 5: Solve for x
    x = 287,784,423.86/21,900.14
  6. Step 6: Final answer
    x = 13,140.76

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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.