Home / 20,930.40-28,875.78-11,973.12

Finding the Fourth Proportional to 20,930.40, 28,875.78 and 11,973.12

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Solution

The fourth proportional to 20,930.40, 28,875.78 and 11,973.12 is: 16,518.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.40 : 28,875.78 = 11,973.12 : x
  2. Step 2: Convert to fraction form
    20,930.40/28,875.78 = 11,973.12/x
  3. Step 3: Cross multiply
    20,930.40x = 28,875.78 × 11,973.12
  4. Step 4: Simplify right side
    20,930.40x = 345,733,179.03
  5. Step 5: Solve for x
    x = 345,733,179.03/20,930.40
  6. Step 6: Final answer
    x = 16,518.23

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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.