Home / 21,840.09-30,139.34-12,408.66

Finding the Fourth Proportional to 21,840.09, 30,139.34 and 12,408.66

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Solution

The fourth proportional to 21,840.09, 30,139.34 and 12,408.66 is: 17,123.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,840.09 : 30,139.34 = 12,408.66 : x
  2. Step 2: Convert to fraction form
    21,840.09/30,139.34 = 12,408.66/x
  3. Step 3: Cross multiply
    21,840.09x = 30,139.34 × 12,408.66
  4. Step 4: Simplify right side
    21,840.09x = 373,988,760.64
  5. Step 5: Solve for x
    x = 373,988,760.64/21,840.09
  6. Step 6: Final answer
    x = 17,123.96

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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.