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Finding the Fourth Proportional to 785.16, 1,175.31 and 668.52

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Solution

The fourth proportional to 785.16, 1,175.31 and 668.52 is: 1,000.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.16 : 1,175.31 = 668.52 : x
  2. Step 2: Convert to fraction form
    785.16/1,175.31 = 668.52/x
  3. Step 3: Cross multiply
    785.16x = 1,175.31 × 668.52
  4. Step 4: Simplify right side
    785.16x = 785,718.24
  5. Step 5: Solve for x
    x = 785,718.24/785.16
  6. Step 6: Final answer
    x = 1,000.71

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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.