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Finding the Fourth Proportional to 9,872, 13,623.36 and 5,456

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Solution

The fourth proportional to 9,872, 13,623.36 and 5,456 is: 7,529.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,872 : 13,623.36 = 5,456 : x
  2. Step 2: Convert to fraction form
    9,872/13,623.36 = 5,456/x
  3. Step 3: Cross multiply
    9,872x = 13,623.36 × 5,456
  4. Step 4: Simplify right side
    9,872x = 74,329,052.16
  5. Step 5: Solve for x
    x = 74,329,052.16/9,872
  6. Step 6: Final answer
    x = 7,529.28

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Why These Related Problems?

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