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Finding the Fourth Proportional to 1,138.75, 1,707.75 and 369.07

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Solution

The fourth proportional to 1,138.75, 1,707.75 and 369.07 is: 553.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.75 : 1,707.75 = 369.07 : x
  2. Step 2: Convert to fraction form
    1,138.75/1,707.75 = 369.07/x
  3. Step 3: Cross multiply
    1,138.75x = 1,707.75 × 369.07
  4. Step 4: Simplify right side
    1,138.75x = 630,279.29
  5. Step 5: Solve for x
    x = 630,279.29/1,138.75
  6. Step 6: Final answer
    x = 553.48

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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.