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Finding the Fourth Proportional to 13,987.62, 20,990.30 and 12,674.06

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Solution

The fourth proportional to 13,987.62, 20,990.30 and 12,674.06 is: 19,019.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,987.62 : 20,990.30 = 12,674.06 : x
  2. Step 2: Convert to fraction form
    13,987.62/20,990.30 = 12,674.06/x
  3. Step 3: Cross multiply
    13,987.62x = 20,990.30 × 12,674.06
  4. Step 4: Simplify right side
    13,987.62x = 266,032,321.62
  5. Step 5: Solve for x
    x = 266,032,321.62/13,987.62
  6. Step 6: Final answer
    x = 19,019.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.