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Finding the Fourth Proportional to 85.48, 118.01 and 64.85

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Solution

The fourth proportional to 85.48, 118.01 and 64.85 is: 89.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.48 : 118.01 = 64.85 : x
  2. Step 2: Convert to fraction form
    85.48/118.01 = 64.85/x
  3. Step 3: Cross multiply
    85.48x = 118.01 × 64.85
  4. Step 4: Simplify right side
    85.48x = 7,652.52
  5. Step 5: Solve for x
    x = 7,652.52/85.48
  6. Step 6: Final answer
    x = 89.53

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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.