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Finding the Fourth Proportional to 913, 1,262.34 and 872.20

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Solution

The fourth proportional to 913, 1,262.34 and 872.20 is: 1,205.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    913 : 1,262.34 = 872.20 : x
  2. Step 2: Convert to fraction form
    913/1,262.34 = 872.20/x
  3. Step 3: Cross multiply
    913x = 1,262.34 × 872.20
  4. Step 4: Simplify right side
    913x = 1,101,012.95
  5. Step 5: Solve for x
    x = 1,101,012.95/913
  6. Step 6: Final answer
    x = 1,205.93

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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.