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Finding the Fourth Proportional to 1,197.89, 1,651.35 and 865.79

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Solution

The fourth proportional to 1,197.89, 1,651.35 and 865.79 is: 1,193.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,197.89 : 1,651.35 = 865.79 : x
  2. Step 2: Convert to fraction form
    1,197.89/1,651.35 = 865.79/x
  3. Step 3: Cross multiply
    1,197.89x = 1,651.35 × 865.79
  4. Step 4: Simplify right side
    1,197.89x = 1,429,722.32
  5. Step 5: Solve for x
    x = 1,429,722.32/1,197.89
  6. Step 6: Final answer
    x = 1,193.53

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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.