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Finding the Fourth Proportional to 785.01, 1,085.67 and 686.60

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Solution

The fourth proportional to 785.01, 1,085.67 and 686.60 is: 949.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.01 : 1,085.67 = 686.60 : x
  2. Step 2: Convert to fraction form
    785.01/1,085.67 = 686.60/x
  3. Step 3: Cross multiply
    785.01x = 1,085.67 × 686.60
  4. Step 4: Simplify right side
    785.01x = 745,419.66
  5. Step 5: Solve for x
    x = 745,419.66/785.01
  6. Step 6: Final answer
    x = 949.56

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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.