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Finding the Fourth Proportional to 66,138.95, 91,257.50 and 39,290.49

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Solution

The fourth proportional to 66,138.95, 91,257.50 and 39,290.49 is: 54,212.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,138.95 : 91,257.50 = 39,290.49 : x
  2. Step 2: Convert to fraction form
    66,138.95/91,257.50 = 39,290.49/x
  3. Step 3: Cross multiply
    66,138.95x = 91,257.50 × 39,290.49
  4. Step 4: Simplify right side
    66,138.95x = 3,585,551,989.40
  5. Step 5: Solve for x
    x = 3,585,551,989.40/66,138.95
  6. Step 6: Final answer
    x = 54,212.41

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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.