Home / 20,782.50-28,679.85-11,351.09

Finding the Fourth Proportional to 20,782.50, 28,679.85 and 11,351.09

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Solution

The fourth proportional to 20,782.50, 28,679.85 and 11,351.09 is: 15,664.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,782.50 : 28,679.85 = 11,351.09 : x
  2. Step 2: Convert to fraction form
    20,782.50/28,679.85 = 11,351.09/x
  3. Step 3: Cross multiply
    20,782.50x = 28,679.85 × 11,351.09
  4. Step 4: Simplify right side
    20,782.50x = 325,547,415.14
  5. Step 5: Solve for x
    x = 325,547,415.14/20,782.50
  6. Step 6: Final answer
    x = 15,664.50

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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.