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Finding the Fourth Proportional to 79.40, 111.07 and 79.40

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Solution

The fourth proportional to 79.40, 111.07 and 79.40 is: 111.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.40 : 111.07 = 79.40 : x
  2. Step 2: Convert to fraction form
    79.40/111.07 = 79.40/x
  3. Step 3: Cross multiply
    79.40x = 111.07 × 79.40
  4. Step 4: Simplify right side
    79.40x = 8,818.96
  5. Step 5: Solve for x
    x = 8,818.96/79.40
  6. Step 6: Final answer
    x = 111.07

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.