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Finding the Fourth Proportional to 78.50, 117.84 and 35.84

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Solution

The fourth proportional to 78.50, 117.84 and 35.84 is: 53.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.50 : 117.84 = 35.84 : x
  2. Step 2: Convert to fraction form
    78.50/117.84 = 35.84/x
  3. Step 3: Cross multiply
    78.50x = 117.84 × 35.84
  4. Step 4: Simplify right side
    78.50x = 4,223.39
  5. Step 5: Solve for x
    x = 4,223.39/78.50
  6. Step 6: Final answer
    x = 53.80

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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.