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Finding the Fourth Proportional to 1,138.87, 1,708.14 and 317.07

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Solution

The fourth proportional to 1,138.87, 1,708.14 and 317.07 is: 475.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.87 : 1,708.14 = 317.07 : x
  2. Step 2: Convert to fraction form
    1,138.87/1,708.14 = 317.07/x
  3. Step 3: Cross multiply
    1,138.87x = 1,708.14 × 317.07
  4. Step 4: Simplify right side
    1,138.87x = 541,601.14
  5. Step 5: Solve for x
    x = 541,601.14/1,138.87
  6. Step 6: Final answer
    x = 475.56

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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.