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Finding the Fourth Proportional to 21,609.86, 29,821.58 and 11,673.86

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Solution

The fourth proportional to 21,609.86, 29,821.58 and 11,673.86 is: 16,109.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,609.86 : 29,821.58 = 11,673.86 : x
  2. Step 2: Convert to fraction form
    21,609.86/29,821.58 = 11,673.86/x
  3. Step 3: Cross multiply
    21,609.86x = 29,821.58 × 11,673.86
  4. Step 4: Simplify right side
    21,609.86x = 348,132,742.42
  5. Step 5: Solve for x
    x = 348,132,742.42/21,609.86
  6. Step 6: Final answer
    x = 16,109.91

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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.