Home / 20,421.51-28,181.55-11,469.78

Finding the Fourth Proportional to 20,421.51, 28,181.55 and 11,469.78

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Solution

The fourth proportional to 20,421.51, 28,181.55 and 11,469.78 is: 15,828.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.51 : 28,181.55 = 11,469.78 : x
  2. Step 2: Convert to fraction form
    20,421.51/28,181.55 = 11,469.78/x
  3. Step 3: Cross multiply
    20,421.51x = 28,181.55 × 11,469.78
  4. Step 4: Simplify right side
    20,421.51x = 323,236,178.56
  5. Step 5: Solve for x
    x = 323,236,178.56/20,421.51
  6. Step 6: Final answer
    x = 15,828.22

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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.