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Finding the Fourth Proportional to 18,761.64, 25,890.72 and 10,378.16

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Solution

The fourth proportional to 18,761.64, 25,890.72 and 10,378.16 is: 14,321.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.64 : 25,890.72 = 10,378.16 : x
  2. Step 2: Convert to fraction form
    18,761.64/25,890.72 = 10,378.16/x
  3. Step 3: Cross multiply
    18,761.64x = 25,890.72 × 10,378.16
  4. Step 4: Simplify right side
    18,761.64x = 268,698,034.68
  5. Step 5: Solve for x
    x = 268,698,034.68/18,761.64
  6. Step 6: Final answer
    x = 14,321.67

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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.