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Finding the Fourth Proportional to 85,636, 118,137.76 and 55,431.04

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Solution

The fourth proportional to 85,636, 118,137.76 and 55,431.04 is: 76,469.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,636 : 118,137.76 = 55,431.04 : x
  2. Step 2: Convert to fraction form
    85,636/118,137.76 = 55,431.04/x
  3. Step 3: Cross multiply
    85,636x = 118,137.76 × 55,431.04
  4. Step 4: Simplify right side
    85,636x = 6,548,498,900.07
  5. Step 5: Solve for x
    x = 6,548,498,900.07/85,636
  6. Step 6: Final answer
    x = 76,469.00

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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.