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Finding the Fourth Proportional to 786.25, 1,179.45 and 209.13

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Solution

The fourth proportional to 786.25, 1,179.45 and 209.13 is: 313.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.25 : 1,179.45 = 209.13 : x
  2. Step 2: Convert to fraction form
    786.25/1,179.45 = 209.13/x
  3. Step 3: Cross multiply
    786.25x = 1,179.45 × 209.13
  4. Step 4: Simplify right side
    786.25x = 246,658.38
  5. Step 5: Solve for x
    x = 246,658.38/786.25
  6. Step 6: Final answer
    x = 313.71

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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.