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Finding the Fourth Proportional to 1,383.90, 2,074.77 and 517.74

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Solution

The fourth proportional to 1,383.90, 2,074.77 and 517.74 is: 776.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.90 : 2,074.77 = 517.74 : x
  2. Step 2: Convert to fraction form
    1,383.90/2,074.77 = 517.74/x
  3. Step 3: Cross multiply
    1,383.90x = 2,074.77 × 517.74
  4. Step 4: Simplify right side
    1,383.90x = 1,074,191.42
  5. Step 5: Solve for x
    x = 1,074,191.42/1,383.90
  6. Step 6: Final answer
    x = 776.21

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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.