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Finding the Fourth Proportional to 66,617.85, 91,931.52 and 36,402.51

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Solution

The fourth proportional to 66,617.85, 91,931.52 and 36,402.51 is: 50,234.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,617.85 : 91,931.52 = 36,402.51 : x
  2. Step 2: Convert to fraction form
    66,617.85/91,931.52 = 36,402.51/x
  3. Step 3: Cross multiply
    66,617.85x = 91,931.52 × 36,402.51
  4. Step 4: Simplify right side
    66,617.85x = 3,346,538,076.12
  5. Step 5: Solve for x
    x = 3,346,538,076.12/66,617.85
  6. Step 6: Final answer
    x = 50,234.86

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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.