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Finding the Fourth Proportional to 18,986.56, 28,466.16 and 9,118.24

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Solution

The fourth proportional to 18,986.56, 28,466.16 and 9,118.24 is: 13,670.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.56 : 28,466.16 = 9,118.24 : x
  2. Step 2: Convert to fraction form
    18,986.56/28,466.16 = 9,118.24/x
  3. Step 3: Cross multiply
    18,986.56x = 28,466.16 × 9,118.24
  4. Step 4: Simplify right side
    18,986.56x = 259,561,278.76
  5. Step 5: Solve for x
    x = 259,561,278.76/18,986.56
  6. Step 6: Final answer
    x = 13,670.79

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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.