Home / 21,205.08-31,806.81-8,721.63

Finding the Fourth Proportional to 21,205.08, 31,806.81 and 8,721.63

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Solution

The fourth proportional to 21,205.08, 31,806.81 and 8,721.63 is: 13,082.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,205.08 : 31,806.81 = 8,721.63 : x
  2. Step 2: Convert to fraction form
    21,205.08/31,806.81 = 8,721.63/x
  3. Step 3: Cross multiply
    21,205.08x = 31,806.81 × 8,721.63
  4. Step 4: Simplify right side
    21,205.08x = 277,407,228.30
  5. Step 5: Solve for x
    x = 277,407,228.30/21,205.08
  6. Step 6: Final answer
    x = 13,082.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.