Home / 21,840.42-30,139.61-12,408.98

Finding the Fourth Proportional to 21,840.42, 30,139.61 and 12,408.98

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Solution

The fourth proportional to 21,840.42, 30,139.61 and 12,408.98 is: 17,124.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,840.42 : 30,139.61 = 12,408.98 : x
  2. Step 2: Convert to fraction form
    21,840.42/30,139.61 = 12,408.98/x
  3. Step 3: Cross multiply
    21,840.42x = 30,139.61 × 12,408.98
  4. Step 4: Simplify right side
    21,840.42x = 374,001,604.95
  5. Step 5: Solve for x
    x = 374,001,604.95/21,840.42
  6. Step 6: Final answer
    x = 17,124.29

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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.