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Finding the Fourth Proportional to 79.16, 117.79 and 78.89

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Solution

The fourth proportional to 79.16, 117.79 and 78.89 is: 117.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.16 : 117.79 = 78.89 : x
  2. Step 2: Convert to fraction form
    79.16/117.79 = 78.89/x
  3. Step 3: Cross multiply
    79.16x = 117.79 × 78.89
  4. Step 4: Simplify right side
    79.16x = 9,291.96
  5. Step 5: Solve for x
    x = 9,291.96/79.16
  6. Step 6: Final answer
    x = 117.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.