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Finding the Fourth Proportional to 18,915.78, 28,339.94 and 11,516.42

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Solution

The fourth proportional to 18,915.78, 28,339.94 and 11,516.42 is: 17,254.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.78 : 28,339.94 = 11,516.42 : x
  2. Step 2: Convert to fraction form
    18,915.78/28,339.94 = 11,516.42/x
  3. Step 3: Cross multiply
    18,915.78x = 28,339.94 × 11,516.42
  4. Step 4: Simplify right side
    18,915.78x = 326,374,651.81
  5. Step 5: Solve for x
    x = 326,374,651.81/18,915.78
  6. Step 6: Final answer
    x = 17,254.09

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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.