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Finding the Fourth Proportional to 79.90, 118.87 and 79.63

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Solution

The fourth proportional to 79.90, 118.87 and 79.63 is: 118.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.90 : 118.87 = 79.63 : x
  2. Step 2: Convert to fraction form
    79.90/118.87 = 79.63/x
  3. Step 3: Cross multiply
    79.90x = 118.87 × 79.63
  4. Step 4: Simplify right side
    79.90x = 9,465.57
  5. Step 5: Solve for x
    x = 9,465.57/79.90
  6. Step 6: Final answer
    x = 118.47

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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.