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Finding the Fourth Proportional to 117, 161.49 and 78.30

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Solution

The fourth proportional to 117, 161.49 and 78.30 is: 108.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    117 : 161.49 = 78.30 : x
  2. Step 2: Convert to fraction form
    117/161.49 = 78.30/x
  3. Step 3: Cross multiply
    117x = 161.49 × 78.30
  4. Step 4: Simplify right side
    117x = 12,644.67
  5. Step 5: Solve for x
    x = 12,644.67/117
  6. Step 6: Final answer
    x = 108.07

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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.