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Finding the Fourth Proportional to 21,571.41, 29,762.74 and 12,621.12

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Solution

The fourth proportional to 21,571.41, 29,762.74 and 12,621.12 is: 17,413.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,571.41 : 29,762.74 = 12,621.12 : x
  2. Step 2: Convert to fraction form
    21,571.41/29,762.74 = 12,621.12/x
  3. Step 3: Cross multiply
    21,571.41x = 29,762.74 × 12,621.12
  4. Step 4: Simplify right side
    21,571.41x = 375,639,113.07
  5. Step 5: Solve for x
    x = 375,639,113.07/21,571.41
  6. Step 6: Final answer
    x = 17,413.75

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1.5x scale

Why These Related Problems?

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