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Finding the Fourth Proportional to 18,923.58, 28,361.22 and 8,390.58

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Solution

The fourth proportional to 18,923.58, 28,361.22 and 8,390.58 is: 12,575.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,923.58 : 28,361.22 = 8,390.58 : x
  2. Step 2: Convert to fraction form
    18,923.58/28,361.22 = 8,390.58/x
  3. Step 3: Cross multiply
    18,923.58x = 28,361.22 × 8,390.58
  4. Step 4: Simplify right side
    18,923.58x = 237,967,085.31
  5. Step 5: Solve for x
    x = 237,967,085.31/18,923.58
  6. Step 6: Final answer
    x = 12,575.16

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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.