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Finding the Fourth Proportional to 1,122.86, 1,684.31 and 429.85

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Solution

The fourth proportional to 1,122.86, 1,684.31 and 429.85 is: 644.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.86 : 1,684.31 = 429.85 : x
  2. Step 2: Convert to fraction form
    1,122.86/1,684.31 = 429.85/x
  3. Step 3: Cross multiply
    1,122.86x = 1,684.31 × 429.85
  4. Step 4: Simplify right side
    1,122.86x = 724,000.65
  5. Step 5: Solve for x
    x = 724,000.65/1,122.86
  6. Step 6: Final answer
    x = 644.78

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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.