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Finding the Fourth Proportional to 783.27, 1,174.85 and 289.69

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Solution

The fourth proportional to 783.27, 1,174.85 and 289.69 is: 434.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.27 : 1,174.85 = 289.69 : x
  2. Step 2: Convert to fraction form
    783.27/1,174.85 = 289.69/x
  3. Step 3: Cross multiply
    783.27x = 1,174.85 × 289.69
  4. Step 4: Simplify right side
    783.27x = 340,342.30
  5. Step 5: Solve for x
    x = 340,342.30/783.27
  6. Step 6: Final answer
    x = 434.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.