Home / 1,118.18-1,677.42-387.81

Finding the Fourth Proportional to 1,118.18, 1,677.42 and 387.81

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Solution

The fourth proportional to 1,118.18, 1,677.42 and 387.81 is: 581.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.18 : 1,677.42 = 387.81 : x
  2. Step 2: Convert to fraction form
    1,118.18/1,677.42 = 387.81/x
  3. Step 3: Cross multiply
    1,118.18x = 1,677.42 × 387.81
  4. Step 4: Simplify right side
    1,118.18x = 650,520.25
  5. Step 5: Solve for x
    x = 650,520.25/1,118.18
  6. Step 6: Final answer
    x = 581.77

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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.