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Finding the Fourth Proportional to 920.50, 1,380.75 and 874.36

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Solution

The fourth proportional to 920.50, 1,380.75 and 874.36 is: 1,311.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.50 : 1,380.75 = 874.36 : x
  2. Step 2: Convert to fraction form
    920.50/1,380.75 = 874.36/x
  3. Step 3: Cross multiply
    920.50x = 1,380.75 × 874.36
  4. Step 4: Simplify right side
    920.50x = 1,207,272.57
  5. Step 5: Solve for x
    x = 1,207,272.57/920.50
  6. Step 6: Final answer
    x = 1,311.54

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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.