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Finding the Fourth Proportional to 1,074.75, 1,478.97 and 1,039.11

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Solution

The fourth proportional to 1,074.75, 1,478.97 and 1,039.11 is: 1,429.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.75 : 1,478.97 = 1,039.11 : x
  2. Step 2: Convert to fraction form
    1,074.75/1,478.97 = 1,039.11/x
  3. Step 3: Cross multiply
    1,074.75x = 1,478.97 × 1,039.11
  4. Step 4: Simplify right side
    1,074.75x = 1,536,812.52
  5. Step 5: Solve for x
    x = 1,536,812.52/1,074.75
  6. Step 6: Final answer
    x = 1,429.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.