Home / 21,172.78-29,216.05-13,102.75

Finding the Fourth Proportional to 21,172.78, 29,216.05 and 13,102.75

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Solution

The fourth proportional to 21,172.78, 29,216.05 and 13,102.75 is: 18,080.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,172.78 : 29,216.05 = 13,102.75 : x
  2. Step 2: Convert to fraction form
    21,172.78/29,216.05 = 13,102.75/x
  3. Step 3: Cross multiply
    21,172.78x = 29,216.05 × 13,102.75
  4. Step 4: Simplify right side
    21,172.78x = 382,810,599.14
  5. Step 5: Solve for x
    x = 382,810,599.14/21,172.78
  6. Step 6: Final answer
    x = 18,080.32

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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.