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Finding the Fourth Proportional to 13,991.65, 21,064.09 and 12,766.93

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Solution

The fourth proportional to 13,991.65, 21,064.09 and 12,766.93 is: 19,220.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.65 : 21,064.09 = 12,766.93 : x
  2. Step 2: Convert to fraction form
    13,991.65/21,064.09 = 12,766.93/x
  3. Step 3: Cross multiply
    13,991.65x = 21,064.09 × 12,766.93
  4. Step 4: Simplify right side
    13,991.65x = 268,923,762.54
  5. Step 5: Solve for x
    x = 268,923,762.54/13,991.65
  6. Step 6: Final answer
    x = 19,220.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.