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Finding the Fourth Proportional to 18,814.55, 28,232.75 and 7,128.68

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Solution

The fourth proportional to 18,814.55, 28,232.75 and 7,128.68 is: 10,697.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,814.55 : 28,232.75 = 7,128.68 : x
  2. Step 2: Convert to fraction form
    18,814.55/28,232.75 = 7,128.68/x
  3. Step 3: Cross multiply
    18,814.55x = 28,232.75 × 7,128.68
  4. Step 4: Simplify right side
    18,814.55x = 201,262,116.93
  5. Step 5: Solve for x
    x = 201,262,116.93/18,814.55
  6. Step 6: Final answer
    x = 10,697.16

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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.