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Finding the Fourth Proportional to 21,009.40, 28,991.64 and 12,057.64

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Solution

The fourth proportional to 21,009.40, 28,991.64 and 12,057.64 is: 16,638.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.40 : 28,991.64 = 12,057.64 : x
  2. Step 2: Convert to fraction form
    21,009.40/28,991.64 = 12,057.64/x
  3. Step 3: Cross multiply
    21,009.40x = 28,991.64 × 12,057.64
  4. Step 4: Simplify right side
    21,009.40x = 349,570,758.13
  5. Step 5: Solve for x
    x = 349,570,758.13/21,009.40
  6. Step 6: Final answer
    x = 16,638.78

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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.