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Finding the Fourth Proportional to 1,039.65, 1,559.79 and 423.69

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Solution

The fourth proportional to 1,039.65, 1,559.79 and 423.69 is: 635.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.65 : 1,559.79 = 423.69 : x
  2. Step 2: Convert to fraction form
    1,039.65/1,559.79 = 423.69/x
  3. Step 3: Cross multiply
    1,039.65x = 1,559.79 × 423.69
  4. Step 4: Simplify right side
    1,039.65x = 660,867.43
  5. Step 5: Solve for x
    x = 660,867.43/1,039.65
  6. Step 6: Final answer
    x = 635.66

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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.