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Finding the Fourth Proportional to 841.98, 1,161.91 and 487.90

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Solution

The fourth proportional to 841.98, 1,161.91 and 487.90 is: 673.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.98 : 1,161.91 = 487.90 : x
  2. Step 2: Convert to fraction form
    841.98/1,161.91 = 487.90/x
  3. Step 3: Cross multiply
    841.98x = 1,161.91 × 487.90
  4. Step 4: Simplify right side
    841.98x = 566,895.89
  5. Step 5: Solve for x
    x = 566,895.89/841.98
  6. Step 6: Final answer
    x = 673.29

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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.