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Finding the Fourth Proportional to 1,209.52, 1,811.93 and 687.95

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Solution

The fourth proportional to 1,209.52, 1,811.93 and 687.95 is: 1,030.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.52 : 1,811.93 = 687.95 : x
  2. Step 2: Convert to fraction form
    1,209.52/1,811.93 = 687.95/x
  3. Step 3: Cross multiply
    1,209.52x = 1,811.93 × 687.95
  4. Step 4: Simplify right side
    1,209.52x = 1,246,517.24
  5. Step 5: Solve for x
    x = 1,246,517.24/1,209.52
  6. Step 6: Final answer
    x = 1,030.59

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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.