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Finding the Fourth Proportional to 2,152.90, 3,228.90 and 920.35

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Solution

The fourth proportional to 2,152.90, 3,228.90 and 920.35 is: 1,380.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,152.90 : 3,228.90 = 920.35 : x
  2. Step 2: Convert to fraction form
    2,152.90/3,228.90 = 920.35/x
  3. Step 3: Cross multiply
    2,152.90x = 3,228.90 × 920.35
  4. Step 4: Simplify right side
    2,152.90x = 2,971,718.12
  5. Step 5: Solve for x
    x = 2,971,718.12/2,152.90
  6. Step 6: Final answer
    x = 1,380.33

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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.