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Finding the Fourth Proportional to 811.75, 1,217.32 and 349.75

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Solution

The fourth proportional to 811.75, 1,217.32 and 349.75 is: 524.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.75 : 1,217.32 = 349.75 : x
  2. Step 2: Convert to fraction form
    811.75/1,217.32 = 349.75/x
  3. Step 3: Cross multiply
    811.75x = 1,217.32 × 349.75
  4. Step 4: Simplify right side
    811.75x = 425,757.67
  5. Step 5: Solve for x
    x = 425,757.67/811.75
  6. Step 6: Final answer
    x = 524.49

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Double scale
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1.5x scale

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.