Home / 21,977.31-30,328.76-11,905.72

Finding the Fourth Proportional to 21,977.31, 30,328.76 and 11,905.72

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Solution

The fourth proportional to 21,977.31, 30,328.76 and 11,905.72 is: 16,429.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,977.31 : 30,328.76 = 11,905.72 : x
  2. Step 2: Convert to fraction form
    21,977.31/30,328.76 = 11,905.72/x
  3. Step 3: Cross multiply
    21,977.31x = 30,328.76 × 11,905.72
  4. Step 4: Simplify right side
    21,977.31x = 361,085,849.05
  5. Step 5: Solve for x
    x = 361,085,849.05/21,977.31
  6. Step 6: Final answer
    x = 16,429.94

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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.