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Finding the Fourth Proportional to 18,917.42, 28,374.16 and 8,387.63

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Solution

The fourth proportional to 18,917.42, 28,374.16 and 8,387.63 is: 12,580.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.42 : 28,374.16 = 8,387.63 : x
  2. Step 2: Convert to fraction form
    18,917.42/28,374.16 = 8,387.63/x
  3. Step 3: Cross multiply
    18,917.42x = 28,374.16 × 8,387.63
  4. Step 4: Simplify right side
    18,917.42x = 237,991,955.64
  5. Step 5: Solve for x
    x = 237,991,955.64/18,917.42
  6. Step 6: Final answer
    x = 12,580.57

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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.