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Finding the Fourth Proportional to 749.75, 1,117.18 and 667.97

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Solution

The fourth proportional to 749.75, 1,117.18 and 667.97 is: 995.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.75 : 1,117.18 = 667.97 : x
  2. Step 2: Convert to fraction form
    749.75/1,117.18 = 667.97/x
  3. Step 3: Cross multiply
    749.75x = 1,117.18 × 667.97
  4. Step 4: Simplify right side
    749.75x = 746,242.72
  5. Step 5: Solve for x
    x = 746,242.72/749.75
  6. Step 6: Final answer
    x = 995.32

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.