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Finding the Fourth Proportional to 66,470.63, 91,729.53 and 38,181.78

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Solution

The fourth proportional to 66,470.63, 91,729.53 and 38,181.78 is: 52,690.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,470.63 : 91,729.53 = 38,181.78 : x
  2. Step 2: Convert to fraction form
    66,470.63/91,729.53 = 38,181.78/x
  3. Step 3: Cross multiply
    66,470.63x = 91,729.53 × 38,181.78
  4. Step 4: Simplify right side
    66,470.63x = 3,502,396,733.96
  5. Step 5: Solve for x
    x = 3,502,396,733.96/66,470.63
  6. Step 6: Final answer
    x = 52,690.90

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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.