Home / 21,121.07-29,154.35-12,172.14

Finding the Fourth Proportional to 21,121.07, 29,154.35 and 12,172.14

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Solution

The fourth proportional to 21,121.07, 29,154.35 and 12,172.14 is: 16,801.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.07 : 29,154.35 = 12,172.14 : x
  2. Step 2: Convert to fraction form
    21,121.07/29,154.35 = 12,172.14/x
  3. Step 3: Cross multiply
    21,121.07x = 29,154.35 × 12,172.14
  4. Step 4: Simplify right side
    21,121.07x = 354,870,768.95
  5. Step 5: Solve for x
    x = 354,870,768.95/21,121.07
  6. Step 6: Final answer
    x = 16,801.75

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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.