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Finding the Fourth Proportional to 15,776.72, 21,863.90 and 15,554

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Solution

The fourth proportional to 15,776.72, 21,863.90 and 15,554 is: 21,555.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,776.72 : 21,863.90 = 15,554 : x
  2. Step 2: Convert to fraction form
    15,776.72/21,863.90 = 15,554/x
  3. Step 3: Cross multiply
    15,776.72x = 21,863.90 × 15,554
  4. Step 4: Simplify right side
    15,776.72x = 340,071,100.60
  5. Step 5: Solve for x
    x = 340,071,100.60/15,776.72
  6. Step 6: Final answer
    x = 21,555.25

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.