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Finding the Fourth Proportional to 920.01, 1,379.18 and 399.69

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Solution

The fourth proportional to 920.01, 1,379.18 and 399.69 is: 599.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.01 : 1,379.18 = 399.69 : x
  2. Step 2: Convert to fraction form
    920.01/1,379.18 = 399.69/x
  3. Step 3: Cross multiply
    920.01x = 1,379.18 × 399.69
  4. Step 4: Simplify right side
    920.01x = 551,243.21
  5. Step 5: Solve for x
    x = 551,243.21/920.01
  6. Step 6: Final answer
    x = 599.17

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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.