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Finding the Fourth Proportional to 920.35, 1,380.57 and 372.25

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Solution

The fourth proportional to 920.35, 1,380.57 and 372.25 is: 558.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.35 : 1,380.57 = 372.25 : x
  2. Step 2: Convert to fraction form
    920.35/1,380.57 = 372.25/x
  3. Step 3: Cross multiply
    920.35x = 1,380.57 × 372.25
  4. Step 4: Simplify right side
    920.35x = 513,917.18
  5. Step 5: Solve for x
    x = 513,917.18/920.35
  6. Step 6: Final answer
    x = 558.39

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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.