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Finding the Fourth Proportional to 20,978.98, 28,951.29 and 11,419.16

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Solution

The fourth proportional to 20,978.98, 28,951.29 and 11,419.16 is: 15,758.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.98 : 28,951.29 = 11,419.16 : x
  2. Step 2: Convert to fraction form
    20,978.98/28,951.29 = 11,419.16/x
  3. Step 3: Cross multiply
    20,978.98x = 28,951.29 × 11,419.16
  4. Step 4: Simplify right side
    20,978.98x = 330,599,412.72
  5. Step 5: Solve for x
    x = 330,599,412.72/20,978.98
  6. Step 6: Final answer
    x = 15,758.60

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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.