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Finding the Fourth Proportional to 1,138.16, 1,707.74 and 445.04

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Solution

The fourth proportional to 1,138.16, 1,707.74 and 445.04 is: 667.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.16 : 1,707.74 = 445.04 : x
  2. Step 2: Convert to fraction form
    1,138.16/1,707.74 = 445.04/x
  3. Step 3: Cross multiply
    1,138.16x = 1,707.74 × 445.04
  4. Step 4: Simplify right side
    1,138.16x = 760,012.61
  5. Step 5: Solve for x
    x = 760,012.61/1,138.16
  6. Step 6: Final answer
    x = 667.76

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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.