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Finding the Fourth Proportional to 18,915.09, 28,368.08 and 8,379.29

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Solution

The fourth proportional to 18,915.09, 28,368.08 and 8,379.29 is: 12,566.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.09 : 28,368.08 = 8,379.29 : x
  2. Step 2: Convert to fraction form
    18,915.09/28,368.08 = 8,379.29/x
  3. Step 3: Cross multiply
    18,915.09x = 28,368.08 × 8,379.29
  4. Step 4: Simplify right side
    18,915.09x = 237,704,369.06
  5. Step 5: Solve for x
    x = 237,704,369.06/18,915.09
  6. Step 6: Final answer
    x = 12,566.92

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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.