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Finding the Fourth Proportional to 15,978.21, 23,973.89 and 6,620.11

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Solution

The fourth proportional to 15,978.21, 23,973.89 and 6,620.11 is: 9,932.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,978.21 : 23,973.89 = 6,620.11 : x
  2. Step 2: Convert to fraction form
    15,978.21/23,973.89 = 6,620.11/x
  3. Step 3: Cross multiply
    15,978.21x = 23,973.89 × 6,620.11
  4. Step 4: Simplify right side
    15,978.21x = 158,709,733.13
  5. Step 5: Solve for x
    x = 158,709,733.13/15,978.21
  6. Step 6: Final answer
    x = 9,932.89

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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.