Home / 21,010.60-28,996.20-11,579.20

Finding the Fourth Proportional to 21,010.60, 28,996.20 and 11,579.20

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Solution

The fourth proportional to 21,010.60, 28,996.20 and 11,579.20 is: 15,980.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,010.60 : 28,996.20 = 11,579.20 : x
  2. Step 2: Convert to fraction form
    21,010.60/28,996.20 = 11,579.20/x
  3. Step 3: Cross multiply
    21,010.60x = 28,996.20 × 11,579.20
  4. Step 4: Simplify right side
    21,010.60x = 335,752,799.04
  5. Step 5: Solve for x
    x = 335,752,799.04/21,010.60
  6. Step 6: Final answer
    x = 15,980.16

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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.