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Finding the Fourth Proportional to 1,245.69, 1,868.78 and 368.21

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Solution

The fourth proportional to 1,245.69, 1,868.78 and 368.21 is: 552.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.69 : 1,868.78 = 368.21 : x
  2. Step 2: Convert to fraction form
    1,245.69/1,868.78 = 368.21/x
  3. Step 3: Cross multiply
    1,245.69x = 1,868.78 × 368.21
  4. Step 4: Simplify right side
    1,245.69x = 688,101.71
  5. Step 5: Solve for x
    x = 688,101.71/1,245.69
  6. Step 6: Final answer
    x = 552.39

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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.