Home / 21,840.28-30,139.42-12,408.84

Finding the Fourth Proportional to 21,840.28, 30,139.42 and 12,408.84

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Solution

The fourth proportional to 21,840.28, 30,139.42 and 12,408.84 is: 17,124.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,840.28 : 30,139.42 = 12,408.84 : x
  2. Step 2: Convert to fraction form
    21,840.28/30,139.42 = 12,408.84/x
  3. Step 3: Cross multiply
    21,840.28x = 30,139.42 × 12,408.84
  4. Step 4: Simplify right side
    21,840.28x = 373,995,240.47
  5. Step 5: Solve for x
    x = 373,995,240.47/21,840.28
  6. Step 6: Final answer
    x = 17,124.10

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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.