Home / 21,012.12-28,996.70-11,580.68

Finding the Fourth Proportional to 21,012.12, 28,996.70 and 11,580.68

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Solution

The fourth proportional to 21,012.12, 28,996.70 and 11,580.68 is: 15,981.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.12 : 28,996.70 = 11,580.68 : x
  2. Step 2: Convert to fraction form
    21,012.12/28,996.70 = 11,580.68/x
  3. Step 3: Cross multiply
    21,012.12x = 28,996.70 × 11,580.68
  4. Step 4: Simplify right side
    21,012.12x = 335,801,503.76
  5. Step 5: Solve for x
    x = 335,801,503.76/21,012.12
  6. Step 6: Final answer
    x = 15,981.32

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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.