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Finding the Fourth Proportional to 780.79, 1,171.19 and 203.66

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Solution

The fourth proportional to 780.79, 1,171.19 and 203.66 is: 305.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.79 : 1,171.19 = 203.66 : x
  2. Step 2: Convert to fraction form
    780.79/1,171.19 = 203.66/x
  3. Step 3: Cross multiply
    780.79x = 1,171.19 × 203.66
  4. Step 4: Simplify right side
    780.79x = 238,524.56
  5. Step 5: Solve for x
    x = 238,524.56/780.79
  6. Step 6: Final answer
    x = 305.49

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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.