Home / 1,245.80-1,868.84-515.28

Finding the Fourth Proportional to 1,245.80, 1,868.84 and 515.28

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Solution

The fourth proportional to 1,245.80, 1,868.84 and 515.28 is: 772.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.80 : 1,868.84 = 515.28 : x
  2. Step 2: Convert to fraction form
    1,245.80/1,868.84 = 515.28/x
  3. Step 3: Cross multiply
    1,245.80x = 1,868.84 × 515.28
  4. Step 4: Simplify right side
    1,245.80x = 962,975.88
  5. Step 5: Solve for x
    x = 962,975.88/1,245.80
  6. Step 6: Final answer
    x = 772.98

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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.