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Finding the Fourth Proportional to 841.62, 1,161.90 and 644.52

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Solution

The fourth proportional to 841.62, 1,161.90 and 644.52 is: 889.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.62 : 1,161.90 = 644.52 : x
  2. Step 2: Convert to fraction form
    841.62/1,161.90 = 644.52/x
  3. Step 3: Cross multiply
    841.62x = 1,161.90 × 644.52
  4. Step 4: Simplify right side
    841.62x = 748,867.79
  5. Step 5: Solve for x
    x = 748,867.79/841.62
  6. Step 6: Final answer
    x = 889.79

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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.