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Finding the Fourth Proportional to 2,169.55, 3,253.65 and 782.70

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Solution

The fourth proportional to 2,169.55, 3,253.65 and 782.70 is: 1,173.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,169.55 : 3,253.65 = 782.70 : x
  2. Step 2: Convert to fraction form
    2,169.55/3,253.65 = 782.70/x
  3. Step 3: Cross multiply
    2,169.55x = 3,253.65 × 782.70
  4. Step 4: Simplify right side
    2,169.55x = 2,546,641.12
  5. Step 5: Solve for x
    x = 2,546,641.12/2,169.55
  6. Step 6: Final answer
    x = 1,173.81

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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.