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Finding the Fourth Proportional to 12,689.64, 19,034.28 and 12,375.90

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Solution

The fourth proportional to 12,689.64, 19,034.28 and 12,375.90 is: 18,563.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.64 : 19,034.28 = 12,375.90 : x
  2. Step 2: Convert to fraction form
    12,689.64/19,034.28 = 12,375.90/x
  3. Step 3: Cross multiply
    12,689.64x = 19,034.28 × 12,375.90
  4. Step 4: Simplify right side
    12,689.64x = 235,566,345.85
  5. Step 5: Solve for x
    x = 235,566,345.85/12,689.64
  6. Step 6: Final answer
    x = 18,563.67

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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.