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Finding the Fourth Proportional to 791.63, 1,088.80 and 693.21

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Solution

The fourth proportional to 791.63, 1,088.80 and 693.21 is: 953.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.63 : 1,088.80 = 693.21 : x
  2. Step 2: Convert to fraction form
    791.63/1,088.80 = 693.21/x
  3. Step 3: Cross multiply
    791.63x = 1,088.80 × 693.21
  4. Step 4: Simplify right side
    791.63x = 754,765.31
  5. Step 5: Solve for x
    x = 754,765.31/791.63
  6. Step 6: Final answer
    x = 953.44

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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.