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Finding the Fourth Proportional to 85.55, 118.02 and 57.87

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Solution

The fourth proportional to 85.55, 118.02 and 57.87 is: 79.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.55 : 118.02 = 57.87 : x
  2. Step 2: Convert to fraction form
    85.55/118.02 = 57.87/x
  3. Step 3: Cross multiply
    85.55x = 118.02 × 57.87
  4. Step 4: Simplify right side
    85.55x = 6,829.60
  5. Step 5: Solve for x
    x = 6,829.60/85.55
  6. Step 6: Final answer
    x = 79.84

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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.