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Finding the Fourth Proportional to 18,995.64, 28,421.13 and 11,471.49

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Solution

The fourth proportional to 18,995.64, 28,421.13 and 11,471.49 is: 17,163.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,995.64 : 28,421.13 = 11,471.49 : x
  2. Step 2: Convert to fraction form
    18,995.64/28,421.13 = 11,471.49/x
  3. Step 3: Cross multiply
    18,995.64x = 28,421.13 × 11,471.49
  4. Step 4: Simplify right side
    18,995.64x = 326,032,708.58
  5. Step 5: Solve for x
    x = 326,032,708.58/18,995.64
  6. Step 6: Final answer
    x = 17,163.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.