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Finding the Fourth Proportional to 841.91, 1,161.81 and 492.57

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Solution

The fourth proportional to 841.91, 1,161.81 and 492.57 is: 679.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.91 : 1,161.81 = 492.57 : x
  2. Step 2: Convert to fraction form
    841.91/1,161.81 = 492.57/x
  3. Step 3: Cross multiply
    841.91x = 1,161.81 × 492.57
  4. Step 4: Simplify right side
    841.91x = 572,272.75
  5. Step 5: Solve for x
    x = 572,272.75/841.91
  6. Step 6: Final answer
    x = 679.74

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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.