Home / 20,939.70-28,895.72-11,508.60

Finding the Fourth Proportional to 20,939.70, 28,895.72 and 11,508.60

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Solution

The fourth proportional to 20,939.70, 28,895.72 and 11,508.60 is: 15,881.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.70 : 28,895.72 = 11,508.60 : x
  2. Step 2: Convert to fraction form
    20,939.70/28,895.72 = 11,508.60/x
  3. Step 3: Cross multiply
    20,939.70x = 28,895.72 × 11,508.60
  4. Step 4: Simplify right side
    20,939.70x = 332,549,283.19
  5. Step 5: Solve for x
    x = 332,549,283.19/20,939.70
  6. Step 6: Final answer
    x = 15,881.28

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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.