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Finding the Fourth Proportional to 78.37, 117.39 and 46.29

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Solution

The fourth proportional to 78.37, 117.39 and 46.29 is: 69.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.37 : 117.39 = 46.29 : x
  2. Step 2: Convert to fraction form
    78.37/117.39 = 46.29/x
  3. Step 3: Cross multiply
    78.37x = 117.39 × 46.29
  4. Step 4: Simplify right side
    78.37x = 5,433.98
  5. Step 5: Solve for x
    x = 5,433.98/78.37
  6. Step 6: Final answer
    x = 69.34

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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.