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Finding the Fourth Proportional to 1,418.90, 2,128.62 and 494.24

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Solution

The fourth proportional to 1,418.90, 2,128.62 and 494.24 is: 741.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.90 : 2,128.62 = 494.24 : x
  2. Step 2: Convert to fraction form
    1,418.90/2,128.62 = 494.24/x
  3. Step 3: Cross multiply
    1,418.90x = 2,128.62 × 494.24
  4. Step 4: Simplify right side
    1,418.90x = 1,052,049.15
  5. Step 5: Solve for x
    x = 1,052,049.15/1,418.90
  6. Step 6: Final answer
    x = 741.45

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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.