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Finding the Fourth Proportional to 13,690.95, 18,896.55 and 8,902.56

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Solution

The fourth proportional to 13,690.95, 18,896.55 and 8,902.56 is: 12,287.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.95 : 18,896.55 = 8,902.56 : x
  2. Step 2: Convert to fraction form
    13,690.95/18,896.55 = 8,902.56/x
  3. Step 3: Cross multiply
    13,690.95x = 18,896.55 × 8,902.56
  4. Step 4: Simplify right side
    13,690.95x = 168,227,670.17
  5. Step 5: Solve for x
    x = 168,227,670.17/13,690.95
  6. Step 6: Final answer
    x = 12,287.51

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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.