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Finding the Fourth Proportional to 65.41, 98.07 and 42.55

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Solution

The fourth proportional to 65.41, 98.07 and 42.55 is: 63.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.41 : 98.07 = 42.55 : x
  2. Step 2: Convert to fraction form
    65.41/98.07 = 42.55/x
  3. Step 3: Cross multiply
    65.41x = 98.07 × 42.55
  4. Step 4: Simplify right side
    65.41x = 4,172.88
  5. Step 5: Solve for x
    x = 4,172.88/65.41
  6. Step 6: Final answer
    x = 63.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.