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Finding the Fourth Proportional to 78.53, 108.35 and 47.42

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Solution

The fourth proportional to 78.53, 108.35 and 47.42 is: 65.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.53 : 108.35 = 47.42 : x
  2. Step 2: Convert to fraction form
    78.53/108.35 = 47.42/x
  3. Step 3: Cross multiply
    78.53x = 108.35 × 47.42
  4. Step 4: Simplify right side
    78.53x = 5,137.72
  5. Step 5: Solve for x
    x = 5,137.72/78.53
  6. Step 6: Final answer
    x = 65.42

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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.