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Finding the Fourth Proportional to 1,208.89, 1,815.30 and 749.59

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Solution

The fourth proportional to 1,208.89, 1,815.30 and 749.59 is: 1,125.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.89 : 1,815.30 = 749.59 : x
  2. Step 2: Convert to fraction form
    1,208.89/1,815.30 = 749.59/x
  3. Step 3: Cross multiply
    1,208.89x = 1,815.30 × 749.59
  4. Step 4: Simplify right side
    1,208.89x = 1,360,730.73
  5. Step 5: Solve for x
    x = 1,360,730.73/1,208.89
  6. Step 6: Final answer
    x = 1,125.60

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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.