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Finding the Fourth Proportional to 15,858, 21,912.91 and 15,089.36

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Solution

The fourth proportional to 15,858, 21,912.91 and 15,089.36 is: 20,850.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,858 : 21,912.91 = 15,089.36 : x
  2. Step 2: Convert to fraction form
    15,858/21,912.91 = 15,089.36/x
  3. Step 3: Cross multiply
    15,858x = 21,912.91 × 15,089.36
  4. Step 4: Simplify right side
    15,858x = 330,651,749.91
  5. Step 5: Solve for x
    x = 330,651,749.91/15,858
  6. Step 6: Final answer
    x = 20,850.79

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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.