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Finding the Fourth Proportional to 21,820.88, 30,113.01 and 12,389.64

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Solution

The fourth proportional to 21,820.88, 30,113.01 and 12,389.64 is: 17,097.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,820.88 : 30,113.01 = 12,389.64 : x
  2. Step 2: Convert to fraction form
    21,820.88/30,113.01 = 12,389.64/x
  3. Step 3: Cross multiply
    21,820.88x = 30,113.01 × 12,389.64
  4. Step 4: Simplify right side
    21,820.88x = 373,089,353.22
  5. Step 5: Solve for x
    x = 373,089,353.22/21,820.88
  6. Step 6: Final answer
    x = 17,097.82

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