Home / 1,118.12-1,677.18-387.30

Finding the Fourth Proportional to 1,118.12, 1,677.18 and 387.30

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Solution

The fourth proportional to 1,118.12, 1,677.18 and 387.30 is: 580.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.12 : 1,677.18 = 387.30 : x
  2. Step 2: Convert to fraction form
    1,118.12/1,677.18 = 387.30/x
  3. Step 3: Cross multiply
    1,118.12x = 1,677.18 × 387.30
  4. Step 4: Simplify right side
    1,118.12x = 649,571.81
  5. Step 5: Solve for x
    x = 649,571.81/1,118.12
  6. Step 6: Final answer
    x = 580.95

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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.