Home / 1,555.06-2,145.42-891.40

Finding the Fourth Proportional to 1,555.06, 2,145.42 and 891.40

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Solution

The fourth proportional to 1,555.06, 2,145.42 and 891.40 is: 1,229.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.06 : 2,145.42 = 891.40 : x
  2. Step 2: Convert to fraction form
    1,555.06/2,145.42 = 891.40/x
  3. Step 3: Cross multiply
    1,555.06x = 2,145.42 × 891.40
  4. Step 4: Simplify right side
    1,555.06x = 1,912,427.39
  5. Step 5: Solve for x
    x = 1,912,427.39/1,555.06
  6. Step 6: Final answer
    x = 1,229.81

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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.