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Finding the Fourth Proportional to 85,687.56, 118,207.62 and 55,477.80

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Solution

The fourth proportional to 85,687.56, 118,207.62 and 55,477.80 is: 76,532.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,687.56 : 118,207.62 = 55,477.80 : x
  2. Step 2: Convert to fraction form
    85,687.56/118,207.62 = 55,477.80/x
  3. Step 3: Cross multiply
    85,687.56x = 118,207.62 × 55,477.80
  4. Step 4: Simplify right side
    85,687.56x = 6,557,898,700.84
  5. Step 5: Solve for x
    x = 6,557,898,700.84/85,687.56
  6. Step 6: Final answer
    x = 76,532.68

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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.