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Finding the Fourth Proportional to 85.90, 118.62 and 63.76

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Solution

The fourth proportional to 85.90, 118.62 and 63.76 is: 88.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.90 : 118.62 = 63.76 : x
  2. Step 2: Convert to fraction form
    85.90/118.62 = 63.76/x
  3. Step 3: Cross multiply
    85.90x = 118.62 × 63.76
  4. Step 4: Simplify right side
    85.90x = 7,563.21
  5. Step 5: Solve for x
    x = 7,563.21/85.90
  6. Step 6: Final answer
    x = 88.05

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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.