Home / 20,861.42-28,788.60-11,429.78

Finding the Fourth Proportional to 20,861.42, 28,788.60 and 11,429.78

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Solution

The fourth proportional to 20,861.42, 28,788.60 and 11,429.78 is: 15,773.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.42 : 28,788.60 = 11,429.78 : x
  2. Step 2: Convert to fraction form
    20,861.42/28,788.60 = 11,429.78/x
  3. Step 3: Cross multiply
    20,861.42x = 28,788.60 × 11,429.78
  4. Step 4: Simplify right side
    20,861.42x = 329,047,364.51
  5. Step 5: Solve for x
    x = 329,047,364.51/20,861.42
  6. Step 6: Final answer
    x = 15,773.01

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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.