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Finding the Fourth Proportional to 407.99, 611.89 and 111.50

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Solution

The fourth proportional to 407.99, 611.89 and 111.50 is: 167.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.99 : 611.89 = 111.50 : x
  2. Step 2: Convert to fraction form
    407.99/611.89 = 111.50/x
  3. Step 3: Cross multiply
    407.99x = 611.89 × 111.50
  4. Step 4: Simplify right side
    407.99x = 68,222.40
  5. Step 5: Solve for x
    x = 68,222.40/407.99
  6. Step 6: Final answer
    x = 167.22

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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.