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Finding the Fourth Proportional to 1,860.60, 2,790 and 1,245

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Solution

The fourth proportional to 1,860.60, 2,790 and 1,245 is: 1,866.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,860.60 : 2,790 = 1,245 : x
  2. Step 2: Convert to fraction form
    1,860.60/2,790 = 1,245/x
  3. Step 3: Cross multiply
    1,860.60x = 2,790 × 1,245
  4. Step 4: Simplify right side
    1,860.60x = 3,473,550
  5. Step 5: Solve for x
    x = 3,473,550/1,860.60
  6. Step 6: Final answer
    x = 1,866.90

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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.