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Finding the Fourth Proportional to 79.99, 120.03 and 28.64

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Solution

The fourth proportional to 79.99, 120.03 and 28.64 is: 42.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.99 : 120.03 = 28.64 : x
  2. Step 2: Convert to fraction form
    79.99/120.03 = 28.64/x
  3. Step 3: Cross multiply
    79.99x = 120.03 × 28.64
  4. Step 4: Simplify right side
    79.99x = 3,437.66
  5. Step 5: Solve for x
    x = 3,437.66/79.99
  6. Step 6: Final answer
    x = 42.98

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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.