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Finding the Fourth Proportional to 841.29, 1,161.09 and 491.97

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Solution

The fourth proportional to 841.29, 1,161.09 and 491.97 is: 678.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.29 : 1,161.09 = 491.97 : x
  2. Step 2: Convert to fraction form
    841.29/1,161.09 = 491.97/x
  3. Step 3: Cross multiply
    841.29x = 1,161.09 × 491.97
  4. Step 4: Simplify right side
    841.29x = 571,221.45
  5. Step 5: Solve for x
    x = 571,221.45/841.29
  6. Step 6: Final answer
    x = 678.98

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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.