Home / 20,986.72-28,962.96-11,557.36

Finding the Fourth Proportional to 20,986.72, 28,962.96 and 11,557.36

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Solution

The fourth proportional to 20,986.72, 28,962.96 and 11,557.36 is: 15,949.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.72 : 28,962.96 = 11,557.36 : x
  2. Step 2: Convert to fraction form
    20,986.72/28,962.96 = 11,557.36/x
  3. Step 3: Cross multiply
    20,986.72x = 28,962.96 × 11,557.36
  4. Step 4: Simplify right side
    20,986.72x = 334,735,355.39
  5. Step 5: Solve for x
    x = 334,735,355.39/20,986.72
  6. Step 6: Final answer
    x = 15,949.87

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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.