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Finding the Fourth Proportional to 21,007, 28,989.75 and 11,575.36

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Solution

The fourth proportional to 21,007, 28,989.75 and 11,575.36 is: 15,974.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007 : 28,989.75 = 11,575.36 : x
  2. Step 2: Convert to fraction form
    21,007/28,989.75 = 11,575.36/x
  3. Step 3: Cross multiply
    21,007x = 28,989.75 × 11,575.36
  4. Step 4: Simplify right side
    21,007x = 335,566,792.56
  5. Step 5: Solve for x
    x = 335,566,792.56/21,007
  6. Step 6: Final answer
    x = 15,974.05

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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.