Home / 21,012.11-28,996.71-11,580.67

Finding the Fourth Proportional to 21,012.11, 28,996.71 and 11,580.67

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Solution

The fourth proportional to 21,012.11, 28,996.71 and 11,580.67 is: 15,981.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.11 : 28,996.71 = 11,580.67 : x
  2. Step 2: Convert to fraction form
    21,012.11/28,996.71 = 11,580.67/x
  3. Step 3: Cross multiply
    21,012.11x = 28,996.71 × 11,580.67
  4. Step 4: Simplify right side
    21,012.11x = 335,801,329.60
  5. Step 5: Solve for x
    x = 335,801,329.60/21,012.11
  6. Step 6: Final answer
    x = 15,981.32

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Half scale
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Double scale
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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.