Home / 1,118.13-1,677.30-387.90

Finding the Fourth Proportional to 1,118.13, 1,677.30 and 387.90

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Solution

The fourth proportional to 1,118.13, 1,677.30 and 387.90 is: 581.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.13 : 1,677.30 = 387.90 : x
  2. Step 2: Convert to fraction form
    1,118.13/1,677.30 = 387.90/x
  3. Step 3: Cross multiply
    1,118.13x = 1,677.30 × 387.90
  4. Step 4: Simplify right side
    1,118.13x = 650,624.67
  5. Step 5: Solve for x
    x = 650,624.67/1,118.13
  6. Step 6: Final answer
    x = 581.89

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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.