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Finding the Fourth Proportional to 18,986.82, 28,486.32 and 9,126.81

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Solution

The fourth proportional to 18,986.82, 28,486.32 and 9,126.81 is: 13,693.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.82 : 28,486.32 = 9,126.81 : x
  2. Step 2: Convert to fraction form
    18,986.82/28,486.32 = 9,126.81/x
  3. Step 3: Cross multiply
    18,986.82x = 28,486.32 × 9,126.81
  4. Step 4: Simplify right side
    18,986.82x = 259,989,230.24
  5. Step 5: Solve for x
    x = 259,989,230.24/18,986.82
  6. Step 6: Final answer
    x = 13,693.14

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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.