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Finding the Fourth Proportional to 1,245.30, 1,866.35 and 515.38

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Solution

The fourth proportional to 1,245.30, 1,866.35 and 515.38 is: 772.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.30 : 1,866.35 = 515.38 : x
  2. Step 2: Convert to fraction form
    1,245.30/1,866.35 = 515.38/x
  3. Step 3: Cross multiply
    1,245.30x = 1,866.35 × 515.38
  4. Step 4: Simplify right side
    1,245.30x = 961,879.46
  5. Step 5: Solve for x
    x = 961,879.46/1,245.30
  6. Step 6: Final answer
    x = 772.41

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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.