Home / 1,207.85-1,811.78-513.77

Finding the Fourth Proportional to 1,207.85, 1,811.78 and 513.77

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Solution

The fourth proportional to 1,207.85, 1,811.78 and 513.77 is: 770.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.85 : 1,811.78 = 513.77 : x
  2. Step 2: Convert to fraction form
    1,207.85/1,811.78 = 513.77/x
  3. Step 3: Cross multiply
    1,207.85x = 1,811.78 × 513.77
  4. Step 4: Simplify right side
    1,207.85x = 930,835.64
  5. Step 5: Solve for x
    x = 930,835.64/1,207.85
  6. Step 6: Final answer
    x = 770.66

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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.