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Finding the Fourth Proportional to 19,478.63, 26,880.53 and 11,521.40

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Solution

The fourth proportional to 19,478.63, 26,880.53 and 11,521.40 is: 15,899.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,478.63 : 26,880.53 = 11,521.40 : x
  2. Step 2: Convert to fraction form
    19,478.63/26,880.53 = 11,521.40/x
  3. Step 3: Cross multiply
    19,478.63x = 26,880.53 × 11,521.40
  4. Step 4: Simplify right side
    19,478.63x = 309,701,146.33
  5. Step 5: Solve for x
    x = 309,701,146.33/19,478.63
  6. Step 6: Final answer
    x = 15,899.53

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.