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Finding the Fourth Proportional to 66,480.40, 91,745 and 38,191.76

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Solution

The fourth proportional to 66,480.40, 91,745 and 38,191.76 is: 52,705.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,480.40 : 91,745 = 38,191.76 : x
  2. Step 2: Convert to fraction form
    66,480.40/91,745 = 38,191.76/x
  3. Step 3: Cross multiply
    66,480.40x = 91,745 × 38,191.76
  4. Step 4: Simplify right side
    66,480.40x = 3,503,903,021.20
  5. Step 5: Solve for x
    x = 3,503,903,021.20/66,480.40
  6. Step 6: Final answer
    x = 52,705.81

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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.