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Finding the Fourth Proportional to 2,635.48, 3,952.80 and 991.80

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Solution

The fourth proportional to 2,635.48, 3,952.80 and 991.80 is: 1,487.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,635.48 : 3,952.80 = 991.80 : x
  2. Step 2: Convert to fraction form
    2,635.48/3,952.80 = 991.80/x
  3. Step 3: Cross multiply
    2,635.48x = 3,952.80 × 991.80
  4. Step 4: Simplify right side
    2,635.48x = 3,920,387.04
  5. Step 5: Solve for x
    x = 3,920,387.04/2,635.48
  6. Step 6: Final answer
    x = 1,487.54

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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.