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Finding the Fourth Proportional to 78,605.85, 117,834.66 and 39,125.64

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Solution

The fourth proportional to 78,605.85, 117,834.66 and 39,125.64 is: 58,651.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,605.85 : 117,834.66 = 39,125.64 : x
  2. Step 2: Convert to fraction form
    78,605.85/117,834.66 = 39,125.64/x
  3. Step 3: Cross multiply
    78,605.85x = 117,834.66 × 39,125.64
  4. Step 4: Simplify right side
    78,605.85x = 4,610,356,486.68
  5. Step 5: Solve for x
    x = 4,610,356,486.68/78,605.85
  6. Step 6: Final answer
    x = 58,651.57

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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.