Home / 20,938.42-28,895.09-11,506.78

Finding the Fourth Proportional to 20,938.42, 28,895.09 and 11,506.78

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Solution

The fourth proportional to 20,938.42, 28,895.09 and 11,506.78 is: 15,879.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,938.42 : 28,895.09 = 11,506.78 : x
  2. Step 2: Convert to fraction form
    20,938.42/28,895.09 = 11,506.78/x
  3. Step 3: Cross multiply
    20,938.42x = 28,895.09 × 11,506.78
  4. Step 4: Simplify right side
    20,938.42x = 332,489,443.71
  5. Step 5: Solve for x
    x = 332,489,443.71/20,938.42
  6. Step 6: Final answer
    x = 15,879.40

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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.