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Finding the Fourth Proportional to 1,171.19, 1,615.95 and 673.97

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Solution

The fourth proportional to 1,171.19, 1,615.95 and 673.97 is: 929.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.19 : 1,615.95 = 673.97 : x
  2. Step 2: Convert to fraction form
    1,171.19/1,615.95 = 673.97/x
  3. Step 3: Cross multiply
    1,171.19x = 1,615.95 × 673.97
  4. Step 4: Simplify right side
    1,171.19x = 1,089,101.82
  5. Step 5: Solve for x
    x = 1,089,101.82/1,171.19
  6. Step 6: Final answer
    x = 929.91

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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.