Home / 21,851.58-30,157.74-12,421.56

Finding the Fourth Proportional to 21,851.58, 30,157.74 and 12,421.56

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Solution

The fourth proportional to 21,851.58, 30,157.74 and 12,421.56 is: 17,143.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,851.58 : 30,157.74 = 12,421.56 : x
  2. Step 2: Convert to fraction form
    21,851.58/30,157.74 = 12,421.56/x
  3. Step 3: Cross multiply
    21,851.58x = 30,157.74 × 12,421.56
  4. Step 4: Simplify right side
    21,851.58x = 374,606,176.87
  5. Step 5: Solve for x
    x = 374,606,176.87/21,851.58
  6. Step 6: Final answer
    x = 17,143.21

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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.