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Finding the Fourth Proportional to 13,871.84, 20,807.78 and 7,631.60

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Solution

The fourth proportional to 13,871.84, 20,807.78 and 7,631.60 is: 11,447.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,871.84 : 20,807.78 = 7,631.60 : x
  2. Step 2: Convert to fraction form
    13,871.84/20,807.78 = 7,631.60/x
  3. Step 3: Cross multiply
    13,871.84x = 20,807.78 × 7,631.60
  4. Step 4: Simplify right side
    13,871.84x = 158,796,511.65
  5. Step 5: Solve for x
    x = 158,796,511.65/13,871.84
  6. Step 6: Final answer
    x = 11,447.40

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1.5x scale

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.