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Finding the Fourth Proportional to 78,642.56, 117,918.86 and 36,500.94

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Solution

The fourth proportional to 78,642.56, 117,918.86 and 36,500.94 is: 54,730.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,642.56 : 117,918.86 = 36,500.94 : x
  2. Step 2: Convert to fraction form
    78,642.56/117,918.86 = 36,500.94/x
  3. Step 3: Cross multiply
    78,642.56x = 117,918.86 × 36,500.94
  4. Step 4: Simplify right side
    78,642.56x = 4,304,149,051.22
  5. Step 5: Solve for x
    x = 4,304,149,051.22/78,642.56
  6. Step 6: Final answer
    x = 54,730.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.