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Finding the Fourth Proportional to 1,138.12, 1,707.27 and 488.69

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Solution

The fourth proportional to 1,138.12, 1,707.27 and 488.69 is: 733.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.12 : 1,707.27 = 488.69 : x
  2. Step 2: Convert to fraction form
    1,138.12/1,707.27 = 488.69/x
  3. Step 3: Cross multiply
    1,138.12x = 1,707.27 × 488.69
  4. Step 4: Simplify right side
    1,138.12x = 834,325.78
  5. Step 5: Solve for x
    x = 834,325.78/1,138.12
  6. Step 6: Final answer
    x = 733.07

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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.