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Finding the Fourth Proportional to 799.74, 1,102.91 and 642.06

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Solution

The fourth proportional to 799.74, 1,102.91 and 642.06 is: 885.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.74 : 1,102.91 = 642.06 : x
  2. Step 2: Convert to fraction form
    799.74/1,102.91 = 642.06/x
  3. Step 3: Cross multiply
    799.74x = 1,102.91 × 642.06
  4. Step 4: Simplify right side
    799.74x = 708,131.18
  5. Step 5: Solve for x
    x = 708,131.18/799.74
  6. Step 6: Final answer
    x = 885.45

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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.