Home / 21,011.76-28,996.32-11,580.12

Finding the Fourth Proportional to 21,011.76, 28,996.32 and 11,580.12

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Solution

The fourth proportional to 21,011.76, 28,996.32 and 11,580.12 is: 15,980.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.76 : 28,996.32 = 11,580.12 : x
  2. Step 2: Convert to fraction form
    21,011.76/28,996.32 = 11,580.12/x
  3. Step 3: Cross multiply
    21,011.76x = 28,996.32 × 11,580.12
  4. Step 4: Simplify right side
    21,011.76x = 335,780,865.16
  5. Step 5: Solve for x
    x = 335,780,865.16/21,011.76
  6. Step 6: Final answer
    x = 15,980.62

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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.