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Finding the Fourth Proportional to 785.50, 1,083.60 and 453.72

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Solution

The fourth proportional to 785.50, 1,083.60 and 453.72 is: 625.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.50 : 1,083.60 = 453.72 : x
  2. Step 2: Convert to fraction form
    785.50/1,083.60 = 453.72/x
  3. Step 3: Cross multiply
    785.50x = 1,083.60 × 453.72
  4. Step 4: Simplify right side
    785.50x = 491,650.99
  5. Step 5: Solve for x
    x = 491,650.99/785.50
  6. Step 6: Final answer
    x = 625.91

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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.