Home / 20,871.40-28,802.61-11,311.30

Finding the Fourth Proportional to 20,871.40, 28,802.61 and 11,311.30

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Solution

The fourth proportional to 20,871.40, 28,802.61 and 11,311.30 is: 15,609.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.40 : 28,802.61 = 11,311.30 : x
  2. Step 2: Convert to fraction form
    20,871.40/28,802.61 = 11,311.30/x
  3. Step 3: Cross multiply
    20,871.40x = 28,802.61 × 11,311.30
  4. Step 4: Simplify right side
    20,871.40x = 325,794,962.49
  5. Step 5: Solve for x
    x = 325,794,962.49/20,871.40
  6. Step 6: Final answer
    x = 15,609.64

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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.