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Finding the Fourth Proportional to 15,301.64, 21,087.64 and 11,939.12

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Solution

The fourth proportional to 15,301.64, 21,087.64 and 11,939.12 is: 16,453.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,301.64 : 21,087.64 = 11,939.12 : x
  2. Step 2: Convert to fraction form
    15,301.64/21,087.64 = 11,939.12/x
  3. Step 3: Cross multiply
    15,301.64x = 21,087.64 × 11,939.12
  4. Step 4: Simplify right side
    15,301.64x = 251,767,864.48
  5. Step 5: Solve for x
    x = 251,767,864.48/15,301.64
  6. Step 6: Final answer
    x = 16,453.65

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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.