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Finding the Fourth Proportional to 1,138.79, 1,708.17 and 317.06

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Solution

The fourth proportional to 1,138.79, 1,708.17 and 317.06 is: 475.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.79 : 1,708.17 = 317.06 : x
  2. Step 2: Convert to fraction form
    1,138.79/1,708.17 = 317.06/x
  3. Step 3: Cross multiply
    1,138.79x = 1,708.17 × 317.06
  4. Step 4: Simplify right side
    1,138.79x = 541,596.65
  5. Step 5: Solve for x
    x = 541,596.65/1,138.79
  6. Step 6: Final answer
    x = 475.59

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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.