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Finding the Fourth Proportional to 1,860.40, 2,790.51 and 763.99

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Solution

The fourth proportional to 1,860.40, 2,790.51 and 763.99 is: 1,145.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,860.40 : 2,790.51 = 763.99 : x
  2. Step 2: Convert to fraction form
    1,860.40/2,790.51 = 763.99/x
  3. Step 3: Cross multiply
    1,860.40x = 2,790.51 × 763.99
  4. Step 4: Simplify right side
    1,860.40x = 2,131,921.73
  5. Step 5: Solve for x
    x = 2,131,921.73/1,860.40
  6. Step 6: Final answer
    x = 1,145.95

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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.