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Finding the Fourth Proportional to 2,190.48, 3,285.68 and 891.64

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Solution

The fourth proportional to 2,190.48, 3,285.68 and 891.64 is: 1,337.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,190.48 : 3,285.68 = 891.64 : x
  2. Step 2: Convert to fraction form
    2,190.48/3,285.68 = 891.64/x
  3. Step 3: Cross multiply
    2,190.48x = 3,285.68 × 891.64
  4. Step 4: Simplify right side
    2,190.48x = 2,929,643.72
  5. Step 5: Solve for x
    x = 2,929,643.72/2,190.48
  6. Step 6: Final answer
    x = 1,337.44

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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.