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Finding the Fourth Proportional to 1,245.66, 1,868.42 and 368.12

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Solution

The fourth proportional to 1,245.66, 1,868.42 and 368.12 is: 552.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.66 : 1,868.42 = 368.12 : x
  2. Step 2: Convert to fraction form
    1,245.66/1,868.42 = 368.12/x
  3. Step 3: Cross multiply
    1,245.66x = 1,868.42 × 368.12
  4. Step 4: Simplify right side
    1,245.66x = 687,791.59
  5. Step 5: Solve for x
    x = 687,791.59/1,245.66
  6. Step 6: Final answer
    x = 552.15

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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.