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Finding the Fourth Proportional to 21,978.54, 30,316.68 and 14,425.29

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Solution

The fourth proportional to 21,978.54, 30,316.68 and 14,425.29 is: 19,897.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978.54 : 30,316.68 = 14,425.29 : x
  2. Step 2: Convert to fraction form
    21,978.54/30,316.68 = 14,425.29/x
  3. Step 3: Cross multiply
    21,978.54x = 30,316.68 × 14,425.29
  4. Step 4: Simplify right side
    21,978.54x = 437,326,900.84
  5. Step 5: Solve for x
    x = 437,326,900.84/21,978.54
  6. Step 6: Final answer
    x = 19,897.90

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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.