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Finding the Fourth Proportional to 1,198.89, 1,798.34 and 712.35

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Solution

The fourth proportional to 1,198.89, 1,798.34 and 712.35 is: 1,068.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,198.89 : 1,798.34 = 712.35 : x
  2. Step 2: Convert to fraction form
    1,198.89/1,798.34 = 712.35/x
  3. Step 3: Cross multiply
    1,198.89x = 1,798.34 × 712.35
  4. Step 4: Simplify right side
    1,198.89x = 1,281,047.50
  5. Step 5: Solve for x
    x = 1,281,047.50/1,198.89
  6. Step 6: Final answer
    x = 1,068.53

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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.