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Finding the Fourth Proportional to 920.85, 1,380.99 and 400.74

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Solution

The fourth proportional to 920.85, 1,380.99 and 400.74 is: 600.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.85 : 1,380.99 = 400.74 : x
  2. Step 2: Convert to fraction form
    920.85/1,380.99 = 400.74/x
  3. Step 3: Cross multiply
    920.85x = 1,380.99 × 400.74
  4. Step 4: Simplify right side
    920.85x = 553,417.93
  5. Step 5: Solve for x
    x = 553,417.93/920.85
  6. Step 6: Final answer
    x = 600.99

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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.