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Finding the Fourth Proportional to 28,419.84, 39,214.08 and 15,843.84

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Solution

The fourth proportional to 28,419.84, 39,214.08 and 15,843.84 is: 21,861.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,419.84 : 39,214.08 = 15,843.84 : x
  2. Step 2: Convert to fraction form
    28,419.84/39,214.08 = 15,843.84/x
  3. Step 3: Cross multiply
    28,419.84x = 39,214.08 × 15,843.84
  4. Step 4: Simplify right side
    28,419.84x = 621,301,609.27
  5. Step 5: Solve for x
    x = 621,301,609.27/28,419.84
  6. Step 6: Final answer
    x = 21,861.54

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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.