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Finding the Fourth Proportional to 405.54, 607.87 and 199.70

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Solution

The fourth proportional to 405.54, 607.87 and 199.70 is: 299.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.54 : 607.87 = 199.70 : x
  2. Step 2: Convert to fraction form
    405.54/607.87 = 199.70/x
  3. Step 3: Cross multiply
    405.54x = 607.87 × 199.70
  4. Step 4: Simplify right side
    405.54x = 121,391.13
  5. Step 5: Solve for x
    x = 121,391.13/405.54
  6. Step 6: Final answer
    x = 299.33

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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.