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Finding the Fourth Proportional to 1,336.12, 2,001.42 and 786.61

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Solution

The fourth proportional to 1,336.12, 2,001.42 and 786.61 is: 1,178.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,336.12 : 2,001.42 = 786.61 : x
  2. Step 2: Convert to fraction form
    1,336.12/2,001.42 = 786.61/x
  3. Step 3: Cross multiply
    1,336.12x = 2,001.42 × 786.61
  4. Step 4: Simplify right side
    1,336.12x = 1,574,336.99
  5. Step 5: Solve for x
    x = 1,574,336.99/1,336.12
  6. Step 6: Final answer
    x = 1,178.29

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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.