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Finding the Fourth Proportional to 799.15, 1,101.76 and 621.87

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Solution

The fourth proportional to 799.15, 1,101.76 and 621.87 is: 857.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.15 : 1,101.76 = 621.87 : x
  2. Step 2: Convert to fraction form
    799.15/1,101.76 = 621.87/x
  3. Step 3: Cross multiply
    799.15x = 1,101.76 × 621.87
  4. Step 4: Simplify right side
    799.15x = 685,151.49
  5. Step 5: Solve for x
    x = 685,151.49/799.15
  6. Step 6: Final answer
    x = 857.35

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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.