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Finding the Fourth Proportional to 20,613, 28,445.94 and 11,660.31

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Solution

The fourth proportional to 20,613, 28,445.94 and 11,660.31 is: 16,091.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,613 : 28,445.94 = 11,660.31 : x
  2. Step 2: Convert to fraction form
    20,613/28,445.94 = 11,660.31/x
  3. Step 3: Cross multiply
    20,613x = 28,445.94 × 11,660.31
  4. Step 4: Simplify right side
    20,613x = 331,688,478.64
  5. Step 5: Solve for x
    x = 331,688,478.64/20,613
  6. Step 6: Final answer
    x = 16,091.23

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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.