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Finding the Fourth Proportional to 21,012.64, 28,997.08 and 11,582.08

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Solution

The fourth proportional to 21,012.64, 28,997.08 and 11,582.08 is: 15,983.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.64 : 28,997.08 = 11,582.08 : x
  2. Step 2: Convert to fraction form
    21,012.64/28,997.08 = 11,582.08/x
  3. Step 3: Cross multiply
    21,012.64x = 28,997.08 × 11,582.08
  4. Step 4: Simplify right side
    21,012.64x = 335,846,500.33
  5. Step 5: Solve for x
    x = 335,846,500.33/21,012.64
  6. Step 6: Final answer
    x = 15,983.07

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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.