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Finding the Fourth Proportional to 61.99, 85.55 and 35.78

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Solution

The fourth proportional to 61.99, 85.55 and 35.78 is: 49.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.99 : 85.55 = 35.78 : x
  2. Step 2: Convert to fraction form
    61.99/85.55 = 35.78/x
  3. Step 3: Cross multiply
    61.99x = 85.55 × 35.78
  4. Step 4: Simplify right side
    61.99x = 3,060.37
  5. Step 5: Solve for x
    x = 3,060.37/61.99
  6. Step 6: Final answer
    x = 49.37

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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.