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Finding the Fourth Proportional to 100.02, 149.76 and 79.80

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Solution

The fourth proportional to 100.02, 149.76 and 79.80 is: 119.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.02 : 149.76 = 79.80 : x
  2. Step 2: Convert to fraction form
    100.02/149.76 = 79.80/x
  3. Step 3: Cross multiply
    100.02x = 149.76 × 79.80
  4. Step 4: Simplify right side
    100.02x = 11,950.85
  5. Step 5: Solve for x
    x = 11,950.85/100.02
  6. Step 6: Final answer
    x = 119.48

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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.