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Finding the Fourth Proportional to 799.66, 1,102.78 and 631.28

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Solution

The fourth proportional to 799.66, 1,102.78 and 631.28 is: 870.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.66 : 1,102.78 = 631.28 : x
  2. Step 2: Convert to fraction form
    799.66/1,102.78 = 631.28/x
  3. Step 3: Cross multiply
    799.66x = 1,102.78 × 631.28
  4. Step 4: Simplify right side
    799.66x = 696,162.96
  5. Step 5: Solve for x
    x = 696,162.96/799.66
  6. Step 6: Final answer
    x = 870.57

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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.