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Finding the Fourth Proportional to 1,213.42, 1,673.85 and 716

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Solution

The fourth proportional to 1,213.42, 1,673.85 and 716 is: 987.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.42 : 1,673.85 = 716 : x
  2. Step 2: Convert to fraction form
    1,213.42/1,673.85 = 716/x
  3. Step 3: Cross multiply
    1,213.42x = 1,673.85 × 716
  4. Step 4: Simplify right side
    1,213.42x = 1,198,476.60
  5. Step 5: Solve for x
    x = 1,198,476.60/1,213.42
  6. Step 6: Final answer
    x = 987.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.