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Finding the Fourth Proportional to 1,086.47, 1,628.87 and 716.39

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Solution

The fourth proportional to 1,086.47, 1,628.87 and 716.39 is: 1,074.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.47 : 1,628.87 = 716.39 : x
  2. Step 2: Convert to fraction form
    1,086.47/1,628.87 = 716.39/x
  3. Step 3: Cross multiply
    1,086.47x = 1,628.87 × 716.39
  4. Step 4: Simplify right side
    1,086.47x = 1,166,894.45
  5. Step 5: Solve for x
    x = 1,166,894.45/1,086.47
  6. Step 6: Final answer
    x = 1,074.03

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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.