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Finding the Fourth Proportional to 21,641.90, 29,860.64 and 12,210.48

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Solution

The fourth proportional to 21,641.90, 29,860.64 and 12,210.48 is: 16,847.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,641.90 : 29,860.64 = 12,210.48 : x
  2. Step 2: Convert to fraction form
    21,641.90/29,860.64 = 12,210.48/x
  3. Step 3: Cross multiply
    21,641.90x = 29,860.64 × 12,210.48
  4. Step 4: Simplify right side
    21,641.90x = 364,612,747.51
  5. Step 5: Solve for x
    x = 364,612,747.51/21,641.90
  6. Step 6: Final answer
    x = 16,847.54

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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.