Home / 3,119.20-4,678.80-810.70

Finding the Fourth Proportional to 3,119.20, 4,678.80 and 810.70

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Solution

The fourth proportional to 3,119.20, 4,678.80 and 810.70 is: 1,216.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,119.20 : 4,678.80 = 810.70 : x
  2. Step 2: Convert to fraction form
    3,119.20/4,678.80 = 810.70/x
  3. Step 3: Cross multiply
    3,119.20x = 4,678.80 × 810.70
  4. Step 4: Simplify right side
    3,119.20x = 3,793,079.77
  5. Step 5: Solve for x
    x = 3,793,079.77/3,119.20
  6. Step 6: Final answer
    x = 1,216.04

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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.