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Finding the Fourth Proportional to 920.43, 1,381.19 and 400.68

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Solution

The fourth proportional to 920.43, 1,381.19 and 400.68 is: 601.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.43 : 1,381.19 = 400.68 : x
  2. Step 2: Convert to fraction form
    920.43/1,381.19 = 400.68/x
  3. Step 3: Cross multiply
    920.43x = 1,381.19 × 400.68
  4. Step 4: Simplify right side
    920.43x = 553,413.21
  5. Step 5: Solve for x
    x = 553,413.21/920.43
  6. Step 6: Final answer
    x = 601.26

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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.