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Finding the Fourth Proportional to 66,491.28, 91,745.41 and 39,636.29

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Solution

The fourth proportional to 66,491.28, 91,745.41 and 39,636.29 is: 54,690.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,491.28 : 91,745.41 = 39,636.29 : x
  2. Step 2: Convert to fraction form
    66,491.28/91,745.41 = 39,636.29/x
  3. Step 3: Cross multiply
    66,491.28x = 91,745.41 × 39,636.29
  4. Step 4: Simplify right side
    66,491.28x = 3,636,447,676.93
  5. Step 5: Solve for x
    x = 3,636,447,676.93/66,491.28
  6. Step 6: Final answer
    x = 54,690.60

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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.