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Finding the Fourth Proportional to 66,281.50, 91,438.22 and 39,408.71

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Solution

The fourth proportional to 66,281.50, 91,438.22 and 39,408.71 is: 54,366.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,281.50 : 91,438.22 = 39,408.71 : x
  2. Step 2: Convert to fraction form
    66,281.50/91,438.22 = 39,408.71/x
  3. Step 3: Cross multiply
    66,281.50x = 91,438.22 × 39,408.71
  4. Step 4: Simplify right side
    66,281.50x = 3,603,462,097.85
  5. Step 5: Solve for x
    x = 3,603,462,097.85/66,281.50
  6. Step 6: Final answer
    x = 54,366.04

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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.