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Finding the Fourth Proportional to 18,726.88, 28,090.30 and 7,631.16

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Solution

The fourth proportional to 18,726.88, 28,090.30 and 7,631.16 is: 11,446.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,726.88 : 28,090.30 = 7,631.16 : x
  2. Step 2: Convert to fraction form
    18,726.88/28,090.30 = 7,631.16/x
  3. Step 3: Cross multiply
    18,726.88x = 28,090.30 × 7,631.16
  4. Step 4: Simplify right side
    18,726.88x = 214,361,573.75
  5. Step 5: Solve for x
    x = 214,361,573.75/18,726.88
  6. Step 6: Final answer
    x = 11,446.73

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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.