Home / 20,986.16-28,961.08-11,555.20

Finding the Fourth Proportional to 20,986.16, 28,961.08 and 11,555.20

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Solution

The fourth proportional to 20,986.16, 28,961.08 and 11,555.20 is: 15,946.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.16 : 28,961.08 = 11,555.20 : x
  2. Step 2: Convert to fraction form
    20,986.16/28,961.08 = 11,555.20/x
  3. Step 3: Cross multiply
    20,986.16x = 28,961.08 × 11,555.20
  4. Step 4: Simplify right side
    20,986.16x = 334,651,071.62
  5. Step 5: Solve for x
    x = 334,651,071.62/20,986.16
  6. Step 6: Final answer
    x = 15,946.27

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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.