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Finding the Fourth Proportional to 1,171.54, 1,615.09 and 816.94

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Solution

The fourth proportional to 1,171.54, 1,615.09 and 816.94 is: 1,126.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.54 : 1,615.09 = 816.94 : x
  2. Step 2: Convert to fraction form
    1,171.54/1,615.09 = 816.94/x
  3. Step 3: Cross multiply
    1,171.54x = 1,615.09 × 816.94
  4. Step 4: Simplify right side
    1,171.54x = 1,319,433.13
  5. Step 5: Solve for x
    x = 1,319,433.13/1,171.54
  6. Step 6: Final answer
    x = 1,126.24

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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.