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Finding the Fourth Proportional to 1,419.64, 2,129.46 and 393.64

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Solution

The fourth proportional to 1,419.64, 2,129.46 and 393.64 is: 590.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.64 : 2,129.46 = 393.64 : x
  2. Step 2: Convert to fraction form
    1,419.64/2,129.46 = 393.64/x
  3. Step 3: Cross multiply
    1,419.64x = 2,129.46 × 393.64
  4. Step 4: Simplify right side
    1,419.64x = 838,240.63
  5. Step 5: Solve for x
    x = 838,240.63/1,419.64
  6. Step 6: Final answer
    x = 590.46

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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.