Home / 1,210.20-1,815.70-516.50

Finding the Fourth Proportional to 1,210.20, 1,815.70 and 516.50

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Solution

The fourth proportional to 1,210.20, 1,815.70 and 516.50 is: 774.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.20 : 1,815.70 = 516.50 : x
  2. Step 2: Convert to fraction form
    1,210.20/1,815.70 = 516.50/x
  3. Step 3: Cross multiply
    1,210.20x = 1,815.70 × 516.50
  4. Step 4: Simplify right side
    1,210.20x = 937,809.05
  5. Step 5: Solve for x
    x = 937,809.05/1,210.20
  6. Step 6: Final answer
    x = 774.92

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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.