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Finding the Fourth Proportional to 117.93, 176.90 and 78.92

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Solution

The fourth proportional to 117.93, 176.90 and 78.92 is: 118.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.93 : 176.90 = 78.92 : x
  2. Step 2: Convert to fraction form
    117.93/176.90 = 78.92/x
  3. Step 3: Cross multiply
    117.93x = 176.90 × 78.92
  4. Step 4: Simplify right side
    117.93x = 13,959.67
  5. Step 5: Solve for x
    x = 13,959.67/117.93
  6. Step 6: Final answer
    x = 118.37

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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.