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Finding the Fourth Proportional to 21,008.88, 28,991.16 and 11,575.68

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Solution

The fourth proportional to 21,008.88, 28,991.16 and 11,575.68 is: 15,973.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.88 : 28,991.16 = 11,575.68 : x
  2. Step 2: Convert to fraction form
    21,008.88/28,991.16 = 11,575.68/x
  3. Step 3: Cross multiply
    21,008.88x = 28,991.16 × 11,575.68
  4. Step 4: Simplify right side
    21,008.88x = 335,592,390.99
  5. Step 5: Solve for x
    x = 335,592,390.99/21,008.88
  6. Step 6: Final answer
    x = 15,973.84

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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.