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Finding the Fourth Proportional to 812.77, 1,218.31 and 745.13

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Solution

The fourth proportional to 812.77, 1,218.31 and 745.13 is: 1,116.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.77 : 1,218.31 = 745.13 : x
  2. Step 2: Convert to fraction form
    812.77/1,218.31 = 745.13/x
  3. Step 3: Cross multiply
    812.77x = 1,218.31 × 745.13
  4. Step 4: Simplify right side
    812.77x = 907,800.51
  5. Step 5: Solve for x
    x = 907,800.51/812.77
  6. Step 6: Final answer
    x = 1,116.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.