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Finding the Fourth Proportional to 18,868.47, 28,314.99 and 7,181.79

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Solution

The fourth proportional to 18,868.47, 28,314.99 and 7,181.79 is: 10,777.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,868.47 : 28,314.99 = 7,181.79 : x
  2. Step 2: Convert to fraction form
    18,868.47/28,314.99 = 7,181.79/x
  3. Step 3: Cross multiply
    18,868.47x = 28,314.99 × 7,181.79
  4. Step 4: Simplify right side
    18,868.47x = 203,352,312.03
  5. Step 5: Solve for x
    x = 203,352,312.03/18,868.47
  6. Step 6: Final answer
    x = 10,777.36

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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.