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Finding the Fourth Proportional to 2,109.68, 3,165.05 and 810.80

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Solution

The fourth proportional to 2,109.68, 3,165.05 and 810.80 is: 1,216.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,109.68 : 3,165.05 = 810.80 : x
  2. Step 2: Convert to fraction form
    2,109.68/3,165.05 = 810.80/x
  3. Step 3: Cross multiply
    2,109.68x = 3,165.05 × 810.80
  4. Step 4: Simplify right side
    2,109.68x = 2,566,208.74
  5. Step 5: Solve for x
    x = 2,566,208.74/2,109.68
  6. Step 6: Final answer
    x = 1,216.40

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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.