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Finding the Fourth Proportional to 786.35, 1,179.54 and 231.10

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Solution

The fourth proportional to 786.35, 1,179.54 and 231.10 is: 346.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.35 : 1,179.54 = 231.10 : x
  2. Step 2: Convert to fraction form
    786.35/1,179.54 = 231.10/x
  3. Step 3: Cross multiply
    786.35x = 1,179.54 × 231.10
  4. Step 4: Simplify right side
    786.35x = 272,588.75
  5. Step 5: Solve for x
    x = 272,588.75/786.35
  6. Step 6: Final answer
    x = 346.65

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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.