Home / 21,121.80-29,146.11-12,622.23

Finding the Fourth Proportional to 21,121.80, 29,146.11 and 12,622.23

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Solution

The fourth proportional to 21,121.80, 29,146.11 and 12,622.23 is: 17,417.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.80 : 29,146.11 = 12,622.23 : x
  2. Step 2: Convert to fraction form
    21,121.80/29,146.11 = 12,622.23/x
  3. Step 3: Cross multiply
    21,121.80x = 29,146.11 × 12,622.23
  4. Step 4: Simplify right side
    21,121.80x = 367,888,935.01
  5. Step 5: Solve for x
    x = 367,888,935.01/21,121.80
  6. Step 6: Final answer
    x = 17,417.50

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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.