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Finding the Fourth Proportional to 789.81, 1,089.75 and 632.58

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Solution

The fourth proportional to 789.81, 1,089.75 and 632.58 is: 872.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.81 : 1,089.75 = 632.58 : x
  2. Step 2: Convert to fraction form
    789.81/1,089.75 = 632.58/x
  3. Step 3: Cross multiply
    789.81x = 1,089.75 × 632.58
  4. Step 4: Simplify right side
    789.81x = 689,354.06
  5. Step 5: Solve for x
    x = 689,354.06/789.81
  6. Step 6: Final answer
    x = 872.81

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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.