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Finding the Fourth Proportional to 1,245.70, 1,868.55 and 515.08

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Solution

The fourth proportional to 1,245.70, 1,868.55 and 515.08 is: 772.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.70 : 1,868.55 = 515.08 : x
  2. Step 2: Convert to fraction form
    1,245.70/1,868.55 = 515.08/x
  3. Step 3: Cross multiply
    1,245.70x = 1,868.55 × 515.08
  4. Step 4: Simplify right side
    1,245.70x = 962,452.73
  5. Step 5: Solve for x
    x = 962,452.73/1,245.70
  6. Step 6: Final answer
    x = 772.62

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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.