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Finding the Fourth Proportional to 785.82, 1,085.60 and 667.60

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Solution

The fourth proportional to 785.82, 1,085.60 and 667.60 is: 922.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.82 : 1,085.60 = 667.60 : x
  2. Step 2: Convert to fraction form
    785.82/1,085.60 = 667.60/x
  3. Step 3: Cross multiply
    785.82x = 1,085.60 × 667.60
  4. Step 4: Simplify right side
    785.82x = 724,746.56
  5. Step 5: Solve for x
    x = 724,746.56/785.82
  6. Step 6: Final answer
    x = 922.28

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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.