Home / 1,212.08-1,818.53-518.72

Finding the Fourth Proportional to 1,212.08, 1,818.53 and 518.72

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Solution

The fourth proportional to 1,212.08, 1,818.53 and 518.72 is: 778.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.08 : 1,818.53 = 518.72 : x
  2. Step 2: Convert to fraction form
    1,212.08/1,818.53 = 518.72/x
  3. Step 3: Cross multiply
    1,212.08x = 1,818.53 × 518.72
  4. Step 4: Simplify right side
    1,212.08x = 943,298.79
  5. Step 5: Solve for x
    x = 943,298.79/1,212.08
  6. Step 6: Final answer
    x = 778.25

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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.