Home / 1,555.05-2,146.20-891.99

Finding the Fourth Proportional to 1,555.05, 2,146.20 and 891.99

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Solution

The fourth proportional to 1,555.05, 2,146.20 and 891.99 is: 1,231.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.05 : 2,146.20 = 891.99 : x
  2. Step 2: Convert to fraction form
    1,555.05/2,146.20 = 891.99/x
  3. Step 3: Cross multiply
    1,555.05x = 2,146.20 × 891.99
  4. Step 4: Simplify right side
    1,555.05x = 1,914,388.94
  5. Step 5: Solve for x
    x = 1,914,388.94/1,555.05
  6. Step 6: Final answer
    x = 1,231.08

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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.