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Finding the Fourth Proportional to 15,681.57, 21,640.47 and 8,511.50

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Solution

The fourth proportional to 15,681.57, 21,640.47 and 8,511.50 is: 11,745.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,681.57 : 21,640.47 = 8,511.50 : x
  2. Step 2: Convert to fraction form
    15,681.57/21,640.47 = 8,511.50/x
  3. Step 3: Cross multiply
    15,681.57x = 21,640.47 × 8,511.50
  4. Step 4: Simplify right side
    15,681.57x = 184,192,752.20
  5. Step 5: Solve for x
    x = 184,192,752.20/15,681.57
  6. Step 6: Final answer
    x = 11,745.81

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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.