Home / 21,872-32,739.96-21,172.16

Finding the Fourth Proportional to 21,872, 32,739.96 and 21,172.16

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Solution

The fourth proportional to 21,872, 32,739.96 and 21,172.16 is: 31,692.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,872 : 32,739.96 = 21,172.16 : x
  2. Step 2: Convert to fraction form
    21,872/32,739.96 = 21,172.16/x
  3. Step 3: Cross multiply
    21,872x = 32,739.96 × 21,172.16
  4. Step 4: Simplify right side
    21,872x = 693,175,671.51
  5. Step 5: Solve for x
    x = 693,175,671.51/21,872
  6. Step 6: Final answer
    x = 31,692.38

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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.