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Finding the Fourth Proportional to 13,221.51, 19,832.13 and 3,987.51

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Solution

The fourth proportional to 13,221.51, 19,832.13 and 3,987.51 is: 5,981.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,221.51 : 19,832.13 = 3,987.51 : x
  2. Step 2: Convert to fraction form
    13,221.51/19,832.13 = 3,987.51/x
  3. Step 3: Cross multiply
    13,221.51x = 19,832.13 × 3,987.51
  4. Step 4: Simplify right side
    13,221.51x = 79,080,816.70
  5. Step 5: Solve for x
    x = 79,080,816.70/13,221.51
  6. Step 6: Final answer
    x = 5,981.22

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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.