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Finding the Fourth Proportional to 85.57, 118.01 and 61.00

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Solution

The fourth proportional to 85.57, 118.01 and 61.00 is: 84.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.57 : 118.01 = 61.00 : x
  2. Step 2: Convert to fraction form
    85.57/118.01 = 61.00/x
  3. Step 3: Cross multiply
    85.57x = 118.01 × 61.00
  4. Step 4: Simplify right side
    85.57x = 7,198.47
  5. Step 5: Solve for x
    x = 7,198.47/85.57
  6. Step 6: Final answer
    x = 84.13

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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.