Home / 20,947.08-28,905.74-11,515.64

Finding the Fourth Proportional to 20,947.08, 28,905.74 and 11,515.64

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Solution

The fourth proportional to 20,947.08, 28,905.74 and 11,515.64 is: 15,890.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,947.08 : 28,905.74 = 11,515.64 : x
  2. Step 2: Convert to fraction form
    20,947.08/28,905.74 = 11,515.64/x
  3. Step 3: Cross multiply
    20,947.08x = 28,905.74 × 11,515.64
  4. Step 4: Simplify right side
    20,947.08x = 332,868,095.77
  5. Step 5: Solve for x
    x = 332,868,095.77/20,947.08
  6. Step 6: Final answer
    x = 15,890.91

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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.