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Finding the Fourth Proportional to 2,153.90, 3,228.51 and 920.30

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Solution

The fourth proportional to 2,153.90, 3,228.51 and 920.30 is: 1,379.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.90 : 3,228.51 = 920.30 : x
  2. Step 2: Convert to fraction form
    2,153.90/3,228.51 = 920.30/x
  3. Step 3: Cross multiply
    2,153.90x = 3,228.51 × 920.30
  4. Step 4: Simplify right side
    2,153.90x = 2,971,197.75
  5. Step 5: Solve for x
    x = 2,971,197.75/2,153.90
  6. Step 6: Final answer
    x = 1,379.45

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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.