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Finding the Fourth Proportional to 786.31, 1,179.47 and 238.49

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Solution

The fourth proportional to 786.31, 1,179.47 and 238.49 is: 357.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.31 : 1,179.47 = 238.49 : x
  2. Step 2: Convert to fraction form
    786.31/1,179.47 = 238.49/x
  3. Step 3: Cross multiply
    786.31x = 1,179.47 × 238.49
  4. Step 4: Simplify right side
    786.31x = 281,293.41
  5. Step 5: Solve for x
    x = 281,293.41/786.31
  6. Step 6: Final answer
    x = 357.74

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Double scale
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Similar ratio
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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.