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Finding the Fourth Proportional to 816.21, 1,218.51 and 790.56

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Solution

The fourth proportional to 816.21, 1,218.51 and 790.56 is: 1,180.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.21 : 1,218.51 = 790.56 : x
  2. Step 2: Convert to fraction form
    816.21/1,218.51 = 790.56/x
  3. Step 3: Cross multiply
    816.21x = 1,218.51 × 790.56
  4. Step 4: Simplify right side
    816.21x = 963,305.27
  5. Step 5: Solve for x
    x = 963,305.27/816.21
  6. Step 6: Final answer
    x = 1,180.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.