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Finding the Fourth Proportional to 10,491.93, 15,728.99 and 3,916.89

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Solution

The fourth proportional to 10,491.93, 15,728.99 and 3,916.89 is: 5,872.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,491.93 : 15,728.99 = 3,916.89 : x
  2. Step 2: Convert to fraction form
    10,491.93/15,728.99 = 3,916.89/x
  3. Step 3: Cross multiply
    10,491.93x = 15,728.99 × 3,916.89
  4. Step 4: Simplify right side
    10,491.93x = 61,608,704.06
  5. Step 5: Solve for x
    x = 61,608,704.06/10,491.93
  6. Step 6: Final answer
    x = 5,872.01

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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.