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Finding the Fourth Proportional to 2,153.75, 3,230.63 and 693.05

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Solution

The fourth proportional to 2,153.75, 3,230.63 and 693.05 is: 1,039.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.75 : 3,230.63 = 693.05 : x
  2. Step 2: Convert to fraction form
    2,153.75/3,230.63 = 693.05/x
  3. Step 3: Cross multiply
    2,153.75x = 3,230.63 × 693.05
  4. Step 4: Simplify right side
    2,153.75x = 2,238,984.66
  5. Step 5: Solve for x
    x = 2,238,984.66/2,153.75
  6. Step 6: Final answer
    x = 1,039.58

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Similar ratio
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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.