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Finding the Fourth Proportional to 785.39, 1,083.66 and 453.78

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Solution

The fourth proportional to 785.39, 1,083.66 and 453.78 is: 626.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.39 : 1,083.66 = 453.78 : x
  2. Step 2: Convert to fraction form
    785.39/1,083.66 = 453.78/x
  3. Step 3: Cross multiply
    785.39x = 1,083.66 × 453.78
  4. Step 4: Simplify right side
    785.39x = 491,743.23
  5. Step 5: Solve for x
    x = 491,743.23/785.39
  6. Step 6: Final answer
    x = 626.12

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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.