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Finding the Fourth Proportional to 2,109.80, 3,164.80 and 877.08

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Solution

The fourth proportional to 2,109.80, 3,164.80 and 877.08 is: 1,315.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,109.80 : 3,164.80 = 877.08 : x
  2. Step 2: Convert to fraction form
    2,109.80/3,164.80 = 877.08/x
  3. Step 3: Cross multiply
    2,109.80x = 3,164.80 × 877.08
  4. Step 4: Simplify right side
    2,109.80x = 2,775,764.77
  5. Step 5: Solve for x
    x = 2,775,764.77/2,109.80
  6. Step 6: Final answer
    x = 1,315.66

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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.