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Finding the Fourth Proportional to 1,372.79, 2,059.39 and 398.77

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Solution

The fourth proportional to 1,372.79, 2,059.39 and 398.77 is: 598.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.79 : 2,059.39 = 398.77 : x
  2. Step 2: Convert to fraction form
    1,372.79/2,059.39 = 398.77/x
  3. Step 3: Cross multiply
    1,372.79x = 2,059.39 × 398.77
  4. Step 4: Simplify right side
    1,372.79x = 821,216.80
  5. Step 5: Solve for x
    x = 821,216.80/1,372.79
  6. Step 6: Final answer
    x = 598.21

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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.