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Finding the Fourth Proportional to 28,408.65, 39,206.72 and 21,226.11

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Solution

The fourth proportional to 28,408.65, 39,206.72 and 21,226.11 is: 29,294.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,408.65 : 39,206.72 = 21,226.11 : x
  2. Step 2: Convert to fraction form
    28,408.65/39,206.72 = 21,226.11/x
  3. Step 3: Cross multiply
    28,408.65x = 39,206.72 × 21,226.11
  4. Step 4: Simplify right side
    28,408.65x = 832,206,045.33
  5. Step 5: Solve for x
    x = 832,206,045.33/28,408.65
  6. Step 6: Final answer
    x = 29,294.11

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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.