Home / 21,106.77-29,128.38-12,155.67

Finding the Fourth Proportional to 21,106.77, 29,128.38 and 12,155.67

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Solution

The fourth proportional to 21,106.77, 29,128.38 and 12,155.67 is: 16,775.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,106.77 : 29,128.38 = 12,155.67 : x
  2. Step 2: Convert to fraction form
    21,106.77/29,128.38 = 12,155.67/x
  3. Step 3: Cross multiply
    21,106.77x = 29,128.38 × 12,155.67
  4. Step 4: Simplify right side
    21,106.77x = 354,074,974.91
  5. Step 5: Solve for x
    x = 354,074,974.91/21,106.77
  6. Step 6: Final answer
    x = 16,775.42

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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.