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Finding the Fourth Proportional to 9,871.88, 13,621.87 and 6,339.87

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Solution

The fourth proportional to 9,871.88, 13,621.87 and 6,339.87 is: 8,748.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,871.88 : 13,621.87 = 6,339.87 : x
  2. Step 2: Convert to fraction form
    9,871.88/13,621.87 = 6,339.87/x
  3. Step 3: Cross multiply
    9,871.88x = 13,621.87 × 6,339.87
  4. Step 4: Simplify right side
    9,871.88x = 86,360,884.96
  5. Step 5: Solve for x
    x = 86,360,884.96/9,871.88
  6. Step 6: Final answer
    x = 8,748.17

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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.