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Finding the Fourth Proportional to 920.08, 1,380.21 and 400.24

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Solution

The fourth proportional to 920.08, 1,380.21 and 400.24 is: 600.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.08 : 1,380.21 = 400.24 : x
  2. Step 2: Convert to fraction form
    920.08/1,380.21 = 400.24/x
  3. Step 3: Cross multiply
    920.08x = 1,380.21 × 400.24
  4. Step 4: Simplify right side
    920.08x = 552,415.25
  5. Step 5: Solve for x
    x = 552,415.25/920.08
  6. Step 6: Final answer
    x = 600.40

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1.5x scale

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.