Home / 1,561.80-2,154.96-1,188.12

Finding the Fourth Proportional to 1,561.80, 2,154.96 and 1,188.12

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Solution

The fourth proportional to 1,561.80, 2,154.96 and 1,188.12 is: 1,639.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.80 : 2,154.96 = 1,188.12 : x
  2. Step 2: Convert to fraction form
    1,561.80/2,154.96 = 1,188.12/x
  3. Step 3: Cross multiply
    1,561.80x = 2,154.96 × 1,188.12
  4. Step 4: Simplify right side
    1,561.80x = 2,560,351.08
  5. Step 5: Solve for x
    x = 2,560,351.08/1,561.80
  6. Step 6: Final answer
    x = 1,639.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.