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Finding the Fourth Proportional to 14,555.72, 21,836.81 and 7,978.52

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Solution

The fourth proportional to 14,555.72, 21,836.81 and 7,978.52 is: 11,969.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,555.72 : 21,836.81 = 7,978.52 : x
  2. Step 2: Convert to fraction form
    14,555.72/21,836.81 = 7,978.52/x
  3. Step 3: Cross multiply
    14,555.72x = 21,836.81 × 7,978.52
  4. Step 4: Simplify right side
    14,555.72x = 174,225,425.32
  5. Step 5: Solve for x
    x = 174,225,425.32/14,555.72
  6. Step 6: Final answer
    x = 11,969.55

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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.