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Finding the Fourth Proportional to 13,705.79, 18,907.94 and 8,037.65

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Solution

The fourth proportional to 13,705.79, 18,907.94 and 8,037.65 is: 11,088.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,705.79 : 18,907.94 = 8,037.65 : x
  2. Step 2: Convert to fraction form
    13,705.79/18,907.94 = 8,037.65/x
  3. Step 3: Cross multiply
    13,705.79x = 18,907.94 × 8,037.65
  4. Step 4: Simplify right side
    13,705.79x = 151,975,471.30
  5. Step 5: Solve for x
    x = 151,975,471.30/13,705.79
  6. Step 6: Final answer
    x = 11,088.42

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1.5x scale

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.