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Finding the Fourth Proportional to 21,978.36, 30,343.14 and 14,437.87

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Solution

The fourth proportional to 21,978.36, 30,343.14 and 14,437.87 is: 19,932.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978.36 : 30,343.14 = 14,437.87 : x
  2. Step 2: Convert to fraction form
    21,978.36/30,343.14 = 14,437.87/x
  3. Step 3: Cross multiply
    21,978.36x = 30,343.14 × 14,437.87
  4. Step 4: Simplify right side
    21,978.36x = 438,090,234.85
  5. Step 5: Solve for x
    x = 438,090,234.85/21,978.36
  6. Step 6: Final answer
    x = 19,932.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.