Home / 2,145.80-3,218.70-991.55

Finding the Fourth Proportional to 2,145.80, 3,218.70 and 991.55

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Solution

The fourth proportional to 2,145.80, 3,218.70 and 991.55 is: 1,487.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.80 : 3,218.70 = 991.55 : x
  2. Step 2: Convert to fraction form
    2,145.80/3,218.70 = 991.55/x
  3. Step 3: Cross multiply
    2,145.80x = 3,218.70 × 991.55
  4. Step 4: Simplify right side
    2,145.80x = 3,191,501.99
  5. Step 5: Solve for x
    x = 3,191,501.99/2,145.80
  6. Step 6: Final answer
    x = 1,487.33

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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.