Home / 1,358.40-2,034.90-1,261.20

Finding the Fourth Proportional to 1,358.40, 2,034.90 and 1,261.20

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Solution

The fourth proportional to 1,358.40, 2,034.90 and 1,261.20 is: 1,889.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.40 : 2,034.90 = 1,261.20 : x
  2. Step 2: Convert to fraction form
    1,358.40/2,034.90 = 1,261.20/x
  3. Step 3: Cross multiply
    1,358.40x = 2,034.90 × 1,261.20
  4. Step 4: Simplify right side
    1,358.40x = 2,566,415.88
  5. Step 5: Solve for x
    x = 2,566,415.88/1,358.40
  6. Step 6: Final answer
    x = 1,889.29

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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.