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Finding the Fourth Proportional to 117.45, 176.16 and 78.95

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Solution

The fourth proportional to 117.45, 176.16 and 78.95 is: 118.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.45 : 176.16 = 78.95 : x
  2. Step 2: Convert to fraction form
    117.45/176.16 = 78.95/x
  3. Step 3: Cross multiply
    117.45x = 176.16 × 78.95
  4. Step 4: Simplify right side
    117.45x = 13,907.83
  5. Step 5: Solve for x
    x = 13,907.83/117.45
  6. Step 6: Final answer
    x = 118.41

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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.