Home / 21,396.07-29,538.23-12,900.38

Finding the Fourth Proportional to 21,396.07, 29,538.23 and 12,900.38

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Solution

The fourth proportional to 21,396.07, 29,538.23 and 12,900.38 is: 17,809.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,396.07 : 29,538.23 = 12,900.38 : x
  2. Step 2: Convert to fraction form
    21,396.07/29,538.23 = 12,900.38/x
  3. Step 3: Cross multiply
    21,396.07x = 29,538.23 × 12,900.38
  4. Step 4: Simplify right side
    21,396.07x = 381,054,391.53
  5. Step 5: Solve for x
    x = 381,054,391.53/21,396.07
  6. Step 6: Final answer
    x = 17,809.55

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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.