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Finding the Fourth Proportional to 86,137.90, 118,860.79 and 51,680.81

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Solution

The fourth proportional to 86,137.90, 118,860.79 and 51,680.81 is: 71,313.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,137.90 : 118,860.79 = 51,680.81 : x
  2. Step 2: Convert to fraction form
    86,137.90/118,860.79 = 51,680.81/x
  3. Step 3: Cross multiply
    86,137.90x = 118,860.79 × 51,680.81
  4. Step 4: Simplify right side
    86,137.90x = 6,142,821,904.44
  5. Step 5: Solve for x
    x = 6,142,821,904.44/86,137.90
  6. Step 6: Final answer
    x = 71,313.81

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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.