Home / 21,977.90-30,330.38-12,419.90

Finding the Fourth Proportional to 21,977.90, 30,330.38 and 12,419.90

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Solution

The fourth proportional to 21,977.90, 30,330.38 and 12,419.90 is: 17,139.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,977.90 : 30,330.38 = 12,419.90 : x
  2. Step 2: Convert to fraction form
    21,977.90/30,330.38 = 12,419.90/x
  3. Step 3: Cross multiply
    21,977.90x = 30,330.38 × 12,419.90
  4. Step 4: Simplify right side
    21,977.90x = 376,700,286.56
  5. Step 5: Solve for x
    x = 376,700,286.56/21,977.90
  6. Step 6: Final answer
    x = 17,139.96

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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.