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Finding the Fourth Proportional to 12,689.82, 19,040.20 and 5,295.74

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Solution

The fourth proportional to 12,689.82, 19,040.20 and 5,295.74 is: 7,945.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.82 : 19,040.20 = 5,295.74 : x
  2. Step 2: Convert to fraction form
    12,689.82/19,040.20 = 5,295.74/x
  3. Step 3: Cross multiply
    12,689.82x = 19,040.20 × 5,295.74
  4. Step 4: Simplify right side
    12,689.82x = 100,831,948.75
  5. Step 5: Solve for x
    x = 100,831,948.75/12,689.82
  6. Step 6: Final answer
    x = 7,945.89

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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.