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Finding the Fourth Proportional to 845.61, 1,167.06 and 721.81

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Solution

The fourth proportional to 845.61, 1,167.06 and 721.81 is: 996.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.61 : 1,167.06 = 721.81 : x
  2. Step 2: Convert to fraction form
    845.61/1,167.06 = 721.81/x
  3. Step 3: Cross multiply
    845.61x = 1,167.06 × 721.81
  4. Step 4: Simplify right side
    845.61x = 842,395.58
  5. Step 5: Solve for x
    x = 842,395.58/845.61
  6. Step 6: Final answer
    x = 996.20

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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.