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Finding the Fourth Proportional to 18,720.99, 28,085.54 and 5,574.42

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Solution

The fourth proportional to 18,720.99, 28,085.54 and 5,574.42 is: 8,362.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.99 : 28,085.54 = 5,574.42 : x
  2. Step 2: Convert to fraction form
    18,720.99/28,085.54 = 5,574.42/x
  3. Step 3: Cross multiply
    18,720.99x = 28,085.54 × 5,574.42
  4. Step 4: Simplify right side
    18,720.99x = 156,560,568.01
  5. Step 5: Solve for x
    x = 156,560,568.01/18,720.99
  6. Step 6: Final answer
    x = 8,362.84

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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.