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Finding the Fourth Proportional to 21,579.89, 29,779.89 and 12,019.52

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Solution

The fourth proportional to 21,579.89, 29,779.89 and 12,019.52 is: 16,586.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,579.89 : 29,779.89 = 12,019.52 : x
  2. Step 2: Convert to fraction form
    21,579.89/29,779.89 = 12,019.52/x
  3. Step 3: Cross multiply
    21,579.89x = 29,779.89 × 12,019.52
  4. Step 4: Simplify right side
    21,579.89x = 357,939,834.55
  5. Step 5: Solve for x
    x = 357,939,834.55/21,579.89
  6. Step 6: Final answer
    x = 16,586.74

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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.