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Finding the Fourth Proportional to 100.69, 150.80 and 79.00

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Solution

The fourth proportional to 100.69, 150.80 and 79.00 is: 118.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.69 : 150.80 = 79.00 : x
  2. Step 2: Convert to fraction form
    100.69/150.80 = 79.00/x
  3. Step 3: Cross multiply
    100.69x = 150.80 × 79.00
  4. Step 4: Simplify right side
    100.69x = 11,912.45
  5. Step 5: Solve for x
    x = 11,912.45/100.69
  6. Step 6: Final answer
    x = 118.31

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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.