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Finding the Fourth Proportional to 1,245.15, 1,868.05 and 367.68

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Solution

The fourth proportional to 1,245.15, 1,868.05 and 367.68 is: 551.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.15 : 1,868.05 = 367.68 : x
  2. Step 2: Convert to fraction form
    1,245.15/1,868.05 = 367.68/x
  3. Step 3: Cross multiply
    1,245.15x = 1,868.05 × 367.68
  4. Step 4: Simplify right side
    1,245.15x = 686,852.09
  5. Step 5: Solve for x
    x = 686,852.09/1,245.15
  6. Step 6: Final answer
    x = 551.62

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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.