Home / 1,621.90-2,238.24-913.75

Finding the Fourth Proportional to 1,621.90, 2,238.24 and 913.75

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Solution

The fourth proportional to 1,621.90, 2,238.24 and 913.75 is: 1,260.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.90 : 2,238.24 = 913.75 : x
  2. Step 2: Convert to fraction form
    1,621.90/2,238.24 = 913.75/x
  3. Step 3: Cross multiply
    1,621.90x = 2,238.24 × 913.75
  4. Step 4: Simplify right side
    1,621.90x = 2,045,191.80
  5. Step 5: Solve for x
    x = 2,045,191.80/1,621.90
  6. Step 6: Final answer
    x = 1,260.99

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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.