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Finding the Fourth Proportional to 791.08, 1,089.75 and 678.67

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Solution

The fourth proportional to 791.08, 1,089.75 and 678.67 is: 934.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.08 : 1,089.75 = 678.67 : x
  2. Step 2: Convert to fraction form
    791.08/1,089.75 = 678.67/x
  3. Step 3: Cross multiply
    791.08x = 1,089.75 × 678.67
  4. Step 4: Simplify right side
    791.08x = 739,580.63
  5. Step 5: Solve for x
    x = 739,580.63/791.08
  6. Step 6: Final answer
    x = 934.90

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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.