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Finding the Fourth Proportional to 1,124.69, 1,687.64 and 1,121.24

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Solution

The fourth proportional to 1,124.69, 1,687.64 and 1,121.24 is: 1,682.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.69 : 1,687.64 = 1,121.24 : x
  2. Step 2: Convert to fraction form
    1,124.69/1,687.64 = 1,121.24/x
  3. Step 3: Cross multiply
    1,124.69x = 1,687.64 × 1,121.24
  4. Step 4: Simplify right side
    1,124.69x = 1,892,248.09
  5. Step 5: Solve for x
    x = 1,892,248.09/1,124.69
  6. Step 6: Final answer
    x = 1,682.47

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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.