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Finding the Fourth Proportional to 85,791.36, 118,363.68 and 51,786.90

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Solution

The fourth proportional to 85,791.36, 118,363.68 and 51,786.90 is: 71,448.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,791.36 : 118,363.68 = 51,786.90 : x
  2. Step 2: Convert to fraction form
    85,791.36/118,363.68 = 51,786.90/x
  3. Step 3: Cross multiply
    85,791.36x = 118,363.68 × 51,786.90
  4. Step 4: Simplify right side
    85,791.36x = 6,129,688,059.79
  5. Step 5: Solve for x
    x = 6,129,688,059.79/85,791.36
  6. Step 6: Final answer
    x = 71,448.78

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1.5x scale

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.