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Finding the Fourth Proportional to 1,074.61, 1,614.62 and 684.79

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Solution

The fourth proportional to 1,074.61, 1,614.62 and 684.79 is: 1,028.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.61 : 1,614.62 = 684.79 : x
  2. Step 2: Convert to fraction form
    1,074.61/1,614.62 = 684.79/x
  3. Step 3: Cross multiply
    1,074.61x = 1,614.62 × 684.79
  4. Step 4: Simplify right side
    1,074.61x = 1,105,668.17
  5. Step 5: Solve for x
    x = 1,105,668.17/1,074.61
  6. Step 6: Final answer
    x = 1,028.90

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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.