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Finding the Fourth Proportional to 1,118.36, 1,677 and 387.68

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Solution

The fourth proportional to 1,118.36, 1,677 and 387.68 is: 581.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.36 : 1,677 = 387.68 : x
  2. Step 2: Convert to fraction form
    1,118.36/1,677 = 387.68/x
  3. Step 3: Cross multiply
    1,118.36x = 1,677 × 387.68
  4. Step 4: Simplify right side
    1,118.36x = 650,139.36
  5. Step 5: Solve for x
    x = 650,139.36/1,118.36
  6. Step 6: Final answer
    x = 581.33

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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.